第一，迷你对话

A:Too hot! This summer's weather is abnormal.

太热了！今年夏天的天气不正常。

B:It's a pity that our classroom is not air-conditioned.

真遗憾教室里没有空调。

A:Air-condition? Are you dreaming? We even haven't a fan.

空调？你做梦呢？我们连台电扇都没有。

B:Maybe a book can do duty for a fan.

或许书本可代替风扇。

A:Yeah, We are so poor.

对呀，我们好可怜啊。

第二，词海拾贝

do duty for something ：充当，代替......之用

e.g. Let’s roll the log up to the fire; it can do duty for a bench.

让我们把这圆木滚到炉火边，它能当凳子用呢。

do duty for someone：替某人履行职务

E.g. Mr Rogers will do duty for me while I'm away next week.

下周我外出时，罗杰斯先生代我履行职务。

第三，短句口译

教室没有装空调。

译：The classroom is not air-conditioned.