1 ADJ （按照规定或法律）必须履行的，强制性的 If something is obligatory, you must do it because of a rule or a law. （按照规定或法律）必须履行的，强制性的
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Most women will be offered an ultrasound scan during pregnancy, although it's not obligatory.
大多数处于妊娠期的妇女将被建议接受超声波检查，不过这不是强制性的。
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These rates do not include the charge for obligatory medical consultations.
这些费用不含必要的就诊费。
2 ADJ [ADJ n] 习惯性的;礼节性的;随大溜的 If you describe something as obligatory, you mean that it is done from habit or custom and not because the person involved has thought carefully about it or really means it. 习惯性的;礼节性的;随大溜的
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His lips curved up in the obligatory smile, acknowledging the compliment.
他嘴边礼节性地挤出一个微笑，以示对称赞致谢。
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She was wearing the obligatory sweater and pearl necklace.
她穿着那件经常穿的毛衣，戴着那串惯常戴的珍珠项链。
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