英语：最常用英语单词：operate

　　1.once (熟义：adv. 曾经，一度)

　　conj. 一旦

　　Once you understand this rule, you will have no further difficulty.

　　一旦明白了这条规则，就再也没有困难了。

　　2.operate (熟义：v. 动手术)

　　v. 操作，操纵;管理 ，经营

　　He operates the lift.

　　他是开电梯的。

　　They operate three factories and a huge warehouse.

　　他们管着三家工厂和一个大仓库。

　　3.order (熟义：n & v. 命令)

　　n.次序;秩序/点菜

　　n & v.订购

　　Some teachers find it difficult to keep order in their classes.

　　有些老师觉得课堂秩序很难维持。

　　We ordered two glasses of milk and some bread.