Working with these children requires a great deal of patience. 和这些孩子打交道需要极大的耐心。

a medical condition requiring urgent treatment 需要紧急治疗的病情

The cause of the accident is still unclear and requires further investigation. 事故的原因还不清楚，需要进一步调查。

Car insurance is required by law in most countries. 大多数国家的法律规定汽车要买保险。

No previous knowledge of Arabic is required for admission to the university. 进这所大学学习不需要以前就懂阿拉伯语。

require sb to do sth The agreement requires all parties to renounce the use of violence. 协议要求所有的党派放弃使用暴力。

be required to do sth The amount that patients are required to pay has been raised. 病人要付的费用已经提高了。

required reading His poems are now required reading on most literature courses. 他的诗现在是大多数文学课程的必读物。