- area of section截面面积，剖面面积;
- angle of attack迎角，冲角，攻角;
- all of sudden突然间
- a piece of workn.一件工作，难事，作品;
- birds of a feather flock togetherpr.物以类聚（一丘之貉）;
- barrel of cement桶装水泥;
- center of gravityn.重心;
- capital contribution认缴资本;
- Export-Import Bank of Washingtonn.美国进出口银行;
- end of the line[电影]死线大突围;
- frames of mindn.心境( frame of mind的名词复数 );
- syrup of plumn.酸梅汤;
- Joint Chiefs of Staff（美国）参谋长联席会议;
- head of the family家长;
- nine times out of tenadv.十之八九;十有八九，大抵，几乎总是;
- out of tuneadv.走调;不协调;走调儿;
- out of nowhere无人
- out of breath喘不过气;
- Organization of American States美洲国家组织;
- of the essence绝对需要的，不可缺少的，极重要的;
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