帮忙翻译下面5句话，谢谢，悬赏提问，2天内需正确完整回复～

来源：百度知道 编辑：UC知道 时间：2024/05/10 17:53:48
1、这些票的有效期只有一个月。（available）
2、老师是脑力劳动者。（mental）
3、勿做不必要的花费。（involve）
4、那位老人的想法已经过时了。（be behind the times）
5、电脑永远不能取代人类。（substitute for）

要快～正确完整的5句话～不要只回复其中几句的！

1.These tickets are available only for one month.
2.The teacher are mental labor force.
3.Don't involve unnecessary expenditure in it.
4.That old man's opinion has already been behind the times.
5.Computers can never substitute for human beings.

1 These tickets are available for only one month.
2 Teachers are mental workers.
3 Don't get involved in unnecessary fees.
4 That old man's thoughts were behind the times.
5 Computers can never substitute for human beings.