The active component, willow bark, was used as a folk remedy as long ago as the 5th century BC.
它来自早在公元前五世纪就被用于民间配方的柳树皮，是这种树皮的一种有效成分。
The active component, salicylic acid, originally from willow bark, was used as a folk remedy as long ago as the 5th century BC.
它来自早在公元前五世纪就被用于民间配方的柳树皮，是这种树皮的一种有效成分。
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