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"attendance is obligatory"; "an obligatory contribution"
"he made all the obligatory apologies"
以上来源于: WordNet
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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