at the time of后面加什么词

　　The movie is set at the time of the Russian revolution.

　　这部电影以俄国革命时期为背景。

　　We need to establish where she was at the time of the shooting.

　　我们需要查实枪击发生时她在何处。

　　Her defence was that she was somewhere completely different at the time of the crime.

　　她的辩词是案发时她根本就不在现场。

　　In mitigation, the defence lawyer said his client was seriously depressed at the time of the assault.

　　为了减轻罪行，辩护律师说他的当事人在袭击人的时候精神极度压抑。

　　The coffee industry was nationalised at the time of independence.

　　国家取得独立时，咖啡行业被收归国有。