这样理解:
require
1. To have as a requisite; need (需要,
必要条件): 如: Most plants require sunlight 大部分植物需要阳光.
2. To call for as obligatory or appropriate; demand (要求为强制性的;需求). 和 demand 同义
3. To impose an obligation on; compel (规定的义务,强迫): 如: Students are required to attend classes 学生规定要上课
request
1. To express a desire for; ask for (表达愿望;要求)如:requested information about the experiment要求看资料; requested to see the evidence firsthand 要求(看到)第一手的证据; requested that the bus driver stop at the next corner.要求公交车司机在下一个街角停下
2. To ask (a person) to do something (要一个人做一些事情)如:The police requested her to accompany them.警方要求她陪从他们本回答被提问者采纳