每日口語(9.03):This kind of tea could act as an aid to

This kind of tea could act as an aid to digestion.
    這種茶可以助消化。
    act as:
     1) do the work of; serve as 當作；充當
     2) play the role of 擔任……的角色
    再如：
    A trained dog can act as a guide to a blind person.
    一條經(jīng)過訓練的狗可以給盲人當向?qū)А?BR>    One of his friends acted as the gobetween in this business.
    在這件事中，他的一個朋友充當了中間人。