Small amounts applied to the skin -such as a salicylic acid-containing toner used once or twice a day -are considered safe, says Johnson.

少量涂抹在皮肤上——比如每天使用一到两次含水杨酸的爽肤水被认为是安全的。Johnson说道。

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Small amounts applied to the skin - such as a salicylic acid-containing toner used once or twice a day - are considered safe, says Johnson.

少量涂抹在皮肤上——比如每天使用一到两次含水杨酸的爽肤水被认为是安全的。Johnson说道。

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The objective is to synthesize 5-fluorouracil derivatives containing 2-5 carbon alkanoic acid.

目的是合成含2-5个碳的直链烷酸功能基的5-氟尿嘧啶衍生物。

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In December 1977 Donald Woods, a journalist and anti-apartheid activist, received a package containing children's T-shirts laced with acid: his young daughter was badly burned.

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He searched for years and eventually lighted on a mixture of oleic acid (a fatty acid found in various vegetable oils) and nitrogen-containing compounds called amines.

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