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。

These rates do not include the charge for obligatory medical consultations.这些费用不含必要的就诊费。

Attendance at seminars is obligatory.研讨会必须出席。

His lips curved up in the obligatory smile, acknowledging the compliment.他嘴边挤出一个习惯性的微笑, 对称赞表示感谢。

She was wearing the obligatory sweater and pearl necklace.她穿着常穿的毛衣, 戴着常戴的珍珠项链。

You may not see the action as morally necessary or obligatory.你或许不会将该行为视为道德上必要或者义不容辞。