| | sour / tart / sick at heart / grieved / sore / aching / pedantic / impractical / to make sarcastic remarks about sb / an acid | HSK 4 |
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| | pungent (taste) / bitter / fig. sad / miserable | HSK 7-9 |
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| | to feel sad | HSK 7-9 |
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| | isotretinoin (used in acne treatment) | |
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| | acetic acid (CH3COOH) / acetate | |
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| | amino acid | |
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| | tannin | |
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| | formylic acid (HCOOH) / formic acid / methanoic acid | |
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| | harsh / scathing / acid (remarks) | |
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| | vitamin C / ascorbic acid | |
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| | tartaric acid | |
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| | tannic acid (loanword) | |
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| | hydrochloric acid HCl | |
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| | citric acid | |
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| | lactic acid | |
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| | saturated fatty acid (SFA) | |
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| | tyrosine (Tyr), an amino acid | |
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| | acid-resistant | |
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| | creatine | |
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| | | |
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| | nitric acid | |
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| | (Tw) amino acid | |
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| | oleic acid | |
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| | fatty acid | |
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| | benzoic acid C6H5COOH | |
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| | sulfurous acid H2SO3 | |
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| | stearic acid / stearate | |
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| | to have a tingling sensation in one's nose (due to grief, pungent odor or taste) / to be choked up | |
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| | niacin (vitamin B3); nicotinic acid; Pyridine-3-carboxylic acid C6H5NO2 | |
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| | acrylic acid C3H4O2 | |
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| | chloric acid HClO3 / chlorate | |
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| | sweet and sour | |
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| | polyunsaturated fatty acid | |
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| | salicylic acid | |
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| | aristolochic acid | |
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| | folic acid | |
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| | gastric acid | |
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| | threonine (Thr), an essential amino acid | |
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| | lysine (Lys), an essential amino acid | |
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| | glutamic acid (Glu), an amino acid | |
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| | taurine | |
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| | deoxyribonucleic acid / DNA | |
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| | cysteine (Cys), an amino acid / mercaptoethyl amine | |
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| | nitrous acid | |
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| | valine (Val), an essential amino acid | |
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| | (of a scholar) impoverished, shabby and pedantic / impoverished pedant | |
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| | sulfuric acid H2SO4 / sulfate | |
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| | peptide (two or more amino acids linked by peptide bonds CO-NH) | |
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| | hypochlorous acid HOCl (bleach) | |
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| | nucleic acid / (coll.) nucleic acid test (abbr. for 核酸檢測|核酸检测) | |
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| | wretched / poverty-stricken / unpresentable (for clothing, gifts etc) | |
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| | ribonucleic acid (RNA) | |
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| | palmitic acid (chemistry) | |
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| | formic acid | |
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| | humic acid | |
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| | weak acid | |
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| | carboxylic acid | |
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| | bitter and sad | |
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| | alanine (Ala), an amino acid | |
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| | nucleotide | |
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| | boric acid H3BO3 | |
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| | sour belching (medical term) | |
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| | hyaluronic acid / hyaluronan | |
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| | cyanic acid HCN | |
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| | silicic acid / silicate | |
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| | phenol C6H5OH / same as 苯酚 | |
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| | pantothenic acid / vitamin B5 / to surge up (of acid in the stomach) | |
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| | aminobenzoic acid | |
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| | DNA | |
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| | methionine (Met), an essential amino acid | |
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| | carbonic acid / carbonate | |
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| | tryptophan (Trp), an essential amino acid | |
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| | oxalic acid C2H2O4 | |
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| | acetic acid (CH3COOH) / ethanoic acid | |
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| | glycine (Gly), an amino acid | |
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| | (Tw) tryptophan | |
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| | unsaturated fatty acid | |
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| | hydrochloric acid HCl / also written 鹽酸|盐酸 | |
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| | (Tw) (biochemistry) theanine | |
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| | linolenic acid | |
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| | proline (Pro), an amino acid | |
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| | iodic acid | |
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| | glacial acetic acid | |
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| | histidine (His), an essential amino acid | |
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| | aspartic acid (Asp), an amino acid | |
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| | pyruvic acid CH3COCOOH | |
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| | phenylalanine (Phe), an essential amino acid | |
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| | (Tw) threonine | |
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| | sour grapes (set expr. based on Aesop) / lit. to say grapes are sour when you can't eat them | |
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| | glycolic acid C2H4O3 | |
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| | (Tw) ornithine | |
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| | acid reflux / regurgitation | |
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| | isoleucine (Ile), an essential amino acid | |
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| | argnine (Arg), an essential amino acid | |
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| | serine (Ser), an amino acid | |
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| | leucine (Leu), an essential amino acid | |
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| | thiocyanic acid | |
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| | carboxylic acid | |
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| | dimethylarsenic acid (CH3)2AsO2H / cacodylic acid | |
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| | dimethylarsenic acid (CH3)2AsO2H / cacodylic acid | |
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