形容词
中文翻译：Unknown
同义词：
['mandatory', 'compulsory', 'requisite']
例句：
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1.The government has made it obligatory for all citizens to register their cars.
政府已规定所有公民必须登记他们的汽车。
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2.He felt an obligatory sense of duty to help those in need.
他感到一种义务感，觉得有责任帮助那些需要帮助的人。
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3. It is obligatory that we finish the work before the deadline.
我们必须在截止日期前完成这项工作，这是义务。