I must be off. Thank you for your help.

It is getting dark. I must be off now.

天越来越黑, 我得走了.

My sister is expecting me, so I must be off now.

姐姐在等我, 因此我得走了.

I must be off now. thank you and see you tomorrow.

我得走了, 谢谢你,明天见.

Sorry, but I really must be off. I must be at work early tomorrow.

对不起, 但是我确实得走了. 我明天一早要上班.

There must be a way round the problem.

这个问题一定有办法解决。

That must be her now.

这会儿一定是她了。

There must be a way around the problem.

肯定有解决这个问题的办法。

All these factors must be allowed for.

所有这些因素都必须估计进去。

You must be home by 11 o'clock.

你必须在11点之前回家。

It must be stressed that this disease is very rare.

必须着重指出，这种病非常罕见。

You must be home for dinner, mind.

记住，你一定得回来吃饭。

His argument was that public spending must be reduced.

他的论点是公共开支必须减缩。

I think he must be cracked, don't you?

我认为他一定是疯了，你说是不是？

If you think about it, those children must be at school by now.

想想吧，那些孩子现在一定在学校了。

The project must be completed within a specific time span.

这项工程必须在规定期限内完成。

The balance of$ 500 must be paid within 90 days.

500元结欠款必须于90天之内付清。

Whatever system you choose, it must be run in properly.

不管你选择什么样的体系，都必须经过适当的磨合。

'I must be crazy,' she thought.

“我准是疯了。”她想。

In order that training should be effective it must be planned systematically.

为使培训有成效，必须有系统的计划。

Children must be taught the difference between right and wrong.

必须教儿童分清是非。