- (formal)
that you must do because of the law, rules, etc. （按法律、規定等）必須的，強制的 The college authorities have now made these classes obligatory. 學院管理部門現已將這些課程列爲必修課。 - obligatory for somebody
These classes are obligatory for all first-year students. 這些課程是所有一年級學生的必修課。 - obligatory to do something
It is obligatory to report all cases of the disease to the authorities. 有義務向當局報告所有的病例。 - obligatory for somebody to do something
It is obligatory for all employees to wear protective clothing. 所有員工必須穿防護服裝。
Extra ExamplesTopics Permission and obligationc1Muslims perform five obligatory prayers each day. 穆斯林每天進行五次強制性祈禱。 Recently safety regulations have made it obligatory for all competitors to wear fist protectors. 最近，所有參賽者都必須按安全規定戴拳套。
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 習慣性的；随大溜的；趕時髦的 Extra ExamplesThe hotel has a terrace with comfy chairs for that obligatory cocktail. 這家旅館有個露台，擺放着舒適的椅子，供人們喝上一杯那似乎是不可或缺的雞尾酒。 It's almost obligatory to have a blog nowadays. 如今幾乎人人都得開博客。
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’.