- at a stroke一下子;
- as clear as a bell极佳， 十分健康;
- answer a letter回答一封信
- a troop of一支队伍
- a series of一系列;一连串;
- a rule of thumb概测法;
- a gust of wind一阵狂风;
- a dose of一剂（药）;
- a crop of一大堆;一批;一组;许许多多;
- a blessing in disguise因祸得福;塞翁失马;焉知非福;有益的痛苦经验;
- a bite to eatn.随便吃点东西;
- a drop in the bucketn.九牛一毛，沧海一粟;杯水车薪;
- be on a rampage横冲直撞;横行;
- be a necessary evil做一个必要的邪恶
- draw to a closev.渐近结束;
- give someone a helping hand帮助别人
- have a short fuse<美口>容易激动[发怒]，脾气暴躁;易于激动;
- have a lesson上课;
- have a go企图， 尝试;抱怨;
- in a jam<美，口>困境;
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