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This kind of tea could act as an aid to digestion.
这种茶可以助消化。
act as:
1) do the work of; serve as 当作；充当
2) play the role of 担任……的角色
再如：
A trained dog can act as a guide to a blind person.
一条经过训练的狗可以给盲人当向导。
One of his friends acted as the gobetween in this business.
在这件事中，他的一个朋友充当了中间人。
