| | air conditioning / air conditioner (including units that have a heating mode) / CL: 臺|台 | HSK 3 |
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| | empty / air / sky / in vain | HSK 4 |
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| | to empty / vacant / unoccupied / space / leisure / free time | HSK 4 |
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| | air / atmosphere | HSK 4 |
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| | space / room / (fig.) scope / leeway / (astronomy) outer space / (physics, math.) space | HSK 5 |
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| | idle / free time / leisure / unused (place) | HSK 5 |
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| | blank space | HSK 6 |
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| | hollow / emptiness / meaningless | HSK 6 |
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| | cavity / empty / vacuous | HSK 6 |
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| | unprecedented and never to be duplicated / the first and the last / unmatched / unique | HSK 6 |
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| | crack / gap between two objects / gap in time between two events | HSK 6 |
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| | daydream / fantasy / to fantasize | HSK 6 |
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| | as empty as anything (idiom); completely bereft / to have nothing / vacuous / hollow / empty (argument, head etc) | |
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| | vacancy | |
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| | blank / blank space on a form / space / 囗 (indicating missing or illegible character) | |
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| | air force | |
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| | in the sky / in the air | |
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| | air purifier | |
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| | to drop from the sky / (fig.) to appear out of nowhere / (attributive) airborne | |
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| | air pollution | |
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| | hollow / (of vegetables) to become hollow or spongy inside / (of a basketball) to swish through (not touching the hoop) | |
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| | on an empty stomach | |
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| | abbr. for 空中小姐 / stewardess / air hostess / female flight attendant | |
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| | air transport | |
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| | free / vacant / unoccupied | |
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| | space station | |
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| | air war / air warfare | |
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| | to set sth aside / to let sth lie idle / idle / unused | |
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| | space bar (keyboard) | |
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| | aerodynamic force | |
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| | empty / vacuous / nothing / vacant / in vain / all for nothing / air-to-air (missile) | |
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| | prattle / idle chit-chat | |
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| | air crash / aviation accident or incident | |
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| | neutral gear | |
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| | lit. wind from an empty cave (idiom) / fig. unfounded (story) / baseless (claim) | |
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| | fresh air / draft | |
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| | absolutely empty (space) / complete vacuum | |
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| | air raid / attack from the air | |
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| | phony / so-called / armchair (expert) / vain (promise) / (finance) short-seller / bear (market) / short (selling) | |
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| | unprecedented | |
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| | flip / somersault | |
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| | aerodynamics | |
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| | spacious and empty / void | |
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| | air base | |
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| | air conditioning | |
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| | (of a ship, train etc) not carrying any load (i.e. no passengers or freight etc) / (electricity) no-load (used to describe the condition of a transformer when there is no load connected to its secondary coil) | |
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| | the empty city stratagem (in which Zhuge Liang presents himself as unperturbed while making it evident that his city is undefended, hoping his adversary will suspect an ambush) / double bluff | |
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| | Air Force One, US presidential jet | |
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| | vacant room | |
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| | empty set (set theory) | |
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| | atmospheric drag | |
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| | flow of air / draft | |
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| | empty / desolate | |
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| | pavilion in the air (idiom); unrealistic Utopian construction / castles in Spain / imaginary future plans | |
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| | hanging gardens (Babylon etc) / rooftop garden | |
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| | empty talk / bunk / malicious gossip | |
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| | air-to-surface (missile) | |
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| | vacant land / open space | |
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| | jejunum (empty gut, middle segment of small intestine between duodenum 十二指腸|十二指肠 and ileum 回腸|回肠) | |
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| | an empty stomach | |
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| | trapeze artist / frequent flyer | |
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| | gap (between two objects) / interval of time (between events) / opening in one's schedule / free time / (fig.) gap (in the market etc) | |
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| | empty nest / a home where the kids have grown up and moved out | |
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| | paratroopers | |
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| | empty-handed / unarmed / (painting, embroidery etc) without following a model / (abbr. for 空手道) karate | |
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| | flight attendant / on-board service | |
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| | to return empty-handed / to fail to win anything | |
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| | vanity / empty fantasy / illusion | |
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| | electron hole (physics) | |
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| | empty place / room (for sb) | |
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| | air conditioned vehicle | |
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| | air commodore / top commander of air force | |
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| | Airbus (aerospace company) | |
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| | empty cave, nothing there (idiom); devoid of substance / nothing new to show | |
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| | blank check | |
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| | utopian socialism | |
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| | diabolo / Chinese yo-yo | |
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| | not a soul in sight (idiom) | |
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| | vague and general / not specific / shallow / empty | |
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| | Chinese yo-yo | |
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| | gap / interval | |
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| | disconnected phone number / unassigned phone number | |
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| | space probe | |
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| | deserted | |
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| | absolutely empty (space) / complete vacuum | |
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| | air freight (cost of air transport) | |
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| | vacancy / unfilled work place | |
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| | bear market | |
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| | air rage | |
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| | macaroni | |
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| | empty-handed | |
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| | air-to-air missile | |
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| | hollow ball / (basketball) swish shot | |
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| | idle clamor / to prattle | |
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| | mere verbal statement cannot be taken as proof (idiom) | |
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| | spare time / free time | |
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