as clear as mud 不清晰，混乱
例句： Your explanation is as clear as mud.
你的解释一点都不清晰。
as soft as down 柔软如绒毛
例句： I lay fast asleep on the couch, which was as soft as down, and did not wake until late in the morning.
我在软如绒毛般的长沙发椅上睡着了，一直睡到早晨很晚才醒来。
at full blast 全速地;大规模地
例句： When we visited the place, work on the construction site was at full blast and all the workers seemed to be working very hard.
当我们去参观时，建筑工地的工作已经全面展开，而且所有的人都在忙碌着。
be above board 光明正大的
be crazy about 爱的发狂
例句： I am really crazy about Michael Jackson's rock'n'roll.
我对麦克杰克逊的摇滚爱的发狂。
be for the birds 荒唐可笑的;毫无价值的
