Require、demand、request、claim都可以表示要求。具体的区别你知道么？一起来看看吧

Require--一般表示因需要而要求

to need something or make something necessary

需要；有赖于；要求；规定

The rules also require employers to provide safety training.

这些规定也要求雇主们提供安全训练。

What clause do you require in the contract?

你要求在合同中订上什么条款?

Demand

作动词，表示：to ask for something forcefully, in a way that shows that you do not expect to be refused 坚决请求，强烈要求；强要

I demanded an explanation.

我要求给我一个解释。

The union is demanding a seven percent pay rise this year.

汽车工会要求今年加薪7%。

He has always demanded the highest standards of behaviour from his children.

他总是以最高的行为准则来要求自己的孩子。

[ + speech ] "And where do you think you're going?" demanded the police officer.

“你觉得自己在朝哪里走？”警察问道。

[ + to infinitive ] I demand to see the manager.

我要求见经理。

[ + that ] She demanded that he return the books he borrowed from her.

她要求他把从她那里借走的书还回来。

作名词：表示困难的要求

His new job makes a lot of demands on him (= he has to work very hard).

新工作对他要求很高。

Request

 the act of politely or officially asking for something

（礼貌、正式的）要求，请求

They received hundreds of requests for more information.

数以百计的人要求他们提供更多的信息。

[ + to infinitive ] The boss refused our request to leave work early.

老板拒绝了我们早下班的请求。

The clause was added to the contract at Carlos's request (= because Carlos asked for this).

这一条款是在卡洛斯的要求下添加到合同中的。

Claim

 to ask for something of value because you think it belongs to you or because you think you have a right to it 要求（拥有）；认领；索取，索  要

The police said that if no one claims the watch, you can keep it.

警方说如果没人认领这块表，你可以留着它。

When King Richard III died, Henry VII claimed the English throne.

理查德三世去世后，亨利七世要求继承英格兰王位。