形容词
中文翻译：Unknown
同义词：
['mandatory', 'compulsory', 'essential', 'indispensable']
例句：
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1. It is obligatory for everyone to wear a mask when in public.
在公共场合，每个人都必须戴口罩。
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2. The company's policy is mandatory for all employees.
公司的政策对所有员工都是强制性的。
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3. She felt the need to take action immediately, which was essential for her success.
她感到立即采取行动的必要性，这对她的成功至关重要。