Used to express obligation, propriety, or expediency.
表义务、礼仪或权宜。
With the infinitive to express obligation or what is expected to happen.
与不定词连用，表示义务获预期发生某事。
The bishops were right to express their "moral obligation to speak up for those who have no voice".
主教们表达“为那些不能发声的人说话是一种道德义务”的观点是正确的。
Any notices hereunder shall be sent to the following addresses by express mail service (EMS) and shall be deemed to have performed the obligation of notice.
本合同项下要求的任何通知，按照下列地址以特快专递邮寄，即视为履行通知义务。
Any notices hereunder shall be sent to the following addresses by express mail service (EMS) and shall be deemed to have performed the obligation of notice.
本合同项下要求的任何通知，按照下列地址以特快专递邮寄，即视为履行通知义务。
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