形容词
中文翻译：必需的
同义词：
['necessary', 'essential', 'vital', 'indispensable']
例句：
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1. Theteacher required students to complete their homework beforeclass.
老师要求学生在课前完成作业。
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2. The meeting was required for all employeesto attend.
会议是所有员工必须参加的。
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3. The new policy is required for allemployees to follow.
新政策对所有员工都必须遵守。