形容词
中文翻译：必须的
同义词：
['compulsory', 'mandatory', 'requisite']
例句：
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1. The government has imposed a ban on the sale of tobacco products in all regions.
政府已经下令在所有地区禁止销售烟草产品。
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2. He felt obligatory to help his friend out when he was in trouble.
当他遇到麻烦时，他觉得有义务帮助他的朋友。
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3. The school had an obligatory assembly to discuss the upcoming exams.
学校举行了一个必须的集会来讨论即将到来的考试。