- (formal)
that you must do because of the law, rules, etc. （按法律、规定等）必须的，强制的 The college authorities have now made these classes obligatory. 学院管理部门现已将这些课程列为必修课。 - obligatory for somebody
These classes are obligatory for all first-year students. 这些课程是所有一年级学生的必修课。 - obligatory to do something
It is obligatory to report all cases of the disease to the authorities. 有义务向当局报告所有的病例。 - obligatory for somebody to do something
It is obligatory for all employees to wear protective clothing. 所有员工必须穿防护服装。
Extra ExamplesTopics Permission and obligationc1Muslims perform five obligatory prayers each day. 穆斯林每天进行五次强制性祈祷。 Recently safety regulations have made it obligatory for all competitors to wear fist protectors. 最近，所有参赛者都必须按安全规定戴拳套。
Oxford Collocations Dictionaryverbs- be
- become
- remain
- …
- almost
- practically
- morally
- …
- for
- (often humorous)
that you do because you always do it, or other people in the same situation always do it 习惯性的；随大溜的；赶时髦的 Extra ExamplesThe hotel has a terrace with comfy chairs for that obligatory cocktail. 这家旅馆有个露台，摆放着舒适的椅子，供人们喝上一杯那似乎是不可或缺的鸡尾酒。 It's almost obligatory to have a blog nowadays. 如今几乎人人都得开博客。
Oxford Collocations Dictionaryverbs- be
- become
- remain
- …
- almost
- practically
- morally
- …
- for
Word Originlate Middle English: from late Latin obligatorius, from Latin obligat- ‘obliged’, from the verb obligare, from ob- ‘towards’ + ligare ‘to bind’.