或者beta hydroxy acid，是水杨酸的一种，被用在一些局部去角质产品中来扭转老化迹象。
BHA, or beta hydroxy acid, is a form of salicylic acid and is used in some topical exfoliants to reverse signs of aging.
到了1897年，一种取自柳树的活性成分柳醇(水杨苷)的衍生合成物——乙酰水杨酸诞生了。
By 1897 a synthetic derivative (acetyl salicylic acid) of the plant's active ingredient (salicin) was created.
三年前，英国研究者报告将链霉素和另一种更新的药物——对氨基水杨酸联合应用可以减少耐药性的发生。
Three years earlier, researchers in Britain reported that combining streptomycin with a newer medicine, para-aminosalicylic acid, could reduce the development of drug resistance.
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