例句：
She does not know if he is alive or dead.
她不知道他是活还是死。
We don't know whether he's alive or dead.
我们不知道他是死是活。
Doctors kept the baby alive for six weeks.
医生使婴儿活了六周。
We are living in a consumer culture.
我们生活在一种消费文化之中。
She's living in hall(s).
她住在学生宿舍。
The cost of living has risen sharply.
生活费用已急剧上涨。
This is a really lively party.
这真是个热闹的聚会。
He is a lively and clever boy.
他是一个活泼聪明的男孩。
The market is quite lively.
市场相当活跃。