obligatory
柯林斯词典
1. ADJ If something is obligatory, you must do it because of a rule or a law. 规定性的
Most women will be offered an ultrasound scan during pregnancy, although it's not obligatory. 大部分妇女怀孕期间都将进行超声波检查，尽管不是规定性的。
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obligatory /ɒˈblɪɡətərɪ/
剑桥词典
- If something is obligatory, you must do it because of a rule or law , etc.
（根据规定、法律等）必须履行的，强制性的，有义务的
The medical examination before you start work is obligatory. 工作前必须先体检。
[ 动词后面接一个带to的不定式 ] The statute made it obligatory for all healthy males between 14 and 60 to work . 这条法令规定所有年龄在14至60岁的男子必须工作。
expected because it usually happens
（因为常发生而）必然的，预料之中的；惯常的
Several Secret Service agents surrounded the President, all wearing the obligatory raincoat and hat . 几名特工围在总统四周，当然是一律穿着风雨衣，戴着帽子。 返回 obligatory