名词
中文翻译：必需的
同义词：
['necessary', 'essential', 'demanded', 'required']
例句：
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1.All the students are required to attend the meeting.
所有学生都必须参加会议。
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2. The company requires employees to wear safety gear.
公司要求员工佩戴安全装备。
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3. He was required to complete the project within a month.
他被要求在一个月内完成这个项目。