复数： dozens

He altered several dozen entitlement formulas and health-care payments .

他改变了几十权利公式和医疗支出。

He chose several dozen new tax cuts and tax increases .

他选择了几十个新减税额和税收的增加而增加。

One recent chilly afternoon , only a few dozen spectators showed up .

最近某个寒冷的下午，那里只迎来了几十位观众。

A bsf can produce several dozen liters of clean water in an hour .

一套bsf系统在一个小时内可以产生几十升清洁的水。

On the positive side , there are several dozen drugs in clinical trials .

从积极的方面说，现在正有几十种药物处于临床试验阶段。