- at the drop of a hat毫不迟疑地，一有机会就;动不动;
- air mailn.航空邮政，航空邮件;
- acid dropn.酸味糖果;
- a drop in the bucketn.九牛一毛，沧海一粟;杯水车薪;
- chain mailn.锁子甲;
- certified mail保证邮件;
- drop through<非正>毫无结果，落空，失败;
- drop someone a linev.留下便条;
- drop shotn.扣球;短球;吊网前球;
- drop out of不参与，退出;
- drop out离开，退出;掉出;脱扣;违世;
- drop off减少;落下;送下车;不知不觉入睡;
- drop handlebars赛车车把;
- drop hammer落锤;桩锤;
- drop by dropadv.一滴一滴地;点点滴滴;
- drop by顺便来访;
- drop box升降梭箱;投件箱;
- drag and dropv.拖放;
- direct mailn.直接邮件，直接邮寄广告;
- Eye drop滴眼剂;
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