observation mission的用法和樣例：
例句
- The OAS General Assembly held in Washington in 1989 requested the General Secretary to accept the invitation of the member states to form electoral observation missions.
一九八九年美洲國家組織大會(huì )在美國華盛頓召開(kāi)的年會(huì )，建議秘書(shū)長(cháng)應行接受會(huì )員國的邀請，組織選舉觀(guān)察團至會(huì )員國觀(guān)選。
