1、几十个
... security personnel 保安人员，安全人员 several dozen sth 几十个…… mortar 迫击炮 ...
Employs Several Dozen Workers雇佣好几十名工人
Several Dozen Years Later上几十年后
several dozen people几十人
several dozen sth几十个
several dozen of them他们中的数十个人
several dozen exercise-books几打练习本