A：Do you object to drinking black tea, Mr.Zhang?

张先生，你不喜欢喝红茶吗?

B：Yes,that is why I never drink it.

是的，所以我永不喝它的。

A：Do you drink green tea,then?

那么你喝绿茶吗?

B：Very seldom, because tea has tannin which may be harmful to one's health.

很少的，因为茶里有单宁酸，对人的健康是有害的。

A：But if the tea is good and well prepared,it will do much good.

但是好的茶叶，泡得又好，是很有益处的呢。

B：What good is it for?

有什么益处?

A：Not only can it appease one's thirst,but it can also refresh one when tired.

茶不但能够止渴，又能使疲惫的人提起精神来。

B：That's true,but it must not be allowed to stand long.

那是对的，但是不可以让它搁得太久。

A：Why is it so?

为什么呢?

B：Because if you drink a kind of tea which has been prepared for some time before,it will do you harm.

因为如果你喝一种放得太久的茶，是没有好处的。