形容词
中文翻译：必需的
同义词：
['necessary', 'essential', 'vital', 'imperative', 'obligatory']
例句：
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1. It is required that everyone present at the meeting should sign the attendance form.
参加会议的人必须签署出席证明。
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2. The teacher required us to finish our homework before class.
老师要求我们在课前完成作业。
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3.He required me to stay late to complete the project on time.
他要求我加班以按时完成项目。