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

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。

He must be going soft in the head.

他一准是脑子出毛病了。

He's ancient ─ he must be at least fifty!

他老得很了——肯定至少有五十岁！

You must be able to speak French for this job.

干这项工作你得会说法语。

I must be going now.

我现在得走了。

He must be 70 if he's a day!

他至少70岁了！

Our ultimate goal must be the preservation of the environment.

我们的最终目的必须是环境保护。

Your feet must be behind the line when you serve.

发球时你的脚必须站在底线的外面。

That is one big hug, Squeaks!

那是一个很大的拥抱，吱吱！

So for now, we can give the whole world a big hug and welcome them to our country.

所以现在，我们给世界一个热情的拥抱并欢迎他们来我国吧。

She gave me a big hug before catching her school bus.

搭校车前她给了我一个大大的拥抱。

When I first met my host mother, Mary, she gave my a big hug.

当我第一次见到我要寄宿那家的母亲玛丽时，她热情地拥抱了我。

My mother gave me a big hug.

妈妈紧紧地抱住我。

After taking the picture I always give them a big hug and say thank you.

每当拍摄完照片之后，我都会给他们一个大大的拥抱，并且说上一句‘谢谢’。