形容词
中文翻译：必须的
同义词：
['essential', 'compulsory', 'mandatory']
例句：
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1. It is obligatory for all students to attend the class meeting.
所有学生都必须参加班会。
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2. The teacher made it clear that attendance was an obligatory requirement.
老师明确表示出勤是强制性要求。
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3. Obligatory duties require us to be punctual and responsible.
义务工作要求我们准时且负责。