v require as useful, just, or proper
v consider obligatory; request and expect
v make someone do something
v have need of
s necessary for relief or supply
s required by rule
a. 必需的
1. You are required to submit your homework by Friday.
你需要在星期五之前提交作业。
2. A valid passport is required for international travel.
国际旅行需要有效护照。
3. The job requires strong communication skills.
这份工作需要良好的沟通能力。