COMB in ADJ (与名词连用构成形容词)表示“无…的”,“不含…的”-free combines with nouns to form adjectives that indicate that something does not have the thing mentioned, or has only a little of it. For example, sugar-free drinks do not contain any sugar, and lead-free petrol is made using only a small amount of lead. (与名词连用构成形容词)表示“无…的”,“不含…的”
...a salt-free diet.
无盐饮食
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