to need something or make something necessary
The rules also require employers to provide safety training.
What clause do you require in the contract?
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.
The union is demanding a seven percent pay rise this year.
He has always demanded the highest standards of behaviour from his children.
[ + speech ] "And where do you think you're going?" demanded the police officer.
[ + to infinitive ] I demand to see the manager.
[ + that ] She demanded that he return the books he borrowed from her.
His new job makes a lot of demands on him (= he has to work very hard).
the act of politely or officially asking for something
They received hundreds of requests for more information.
[ + to infinitive ] The boss refused our request to leave work early.
The clause was added to the contract at Carlos's request (= because Carlos asked for this).
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.
When King Richard III died, Henry VII claimed the English throne.