operate
vi.运转;动手术;起作用 vt.操作;经营
The Lewis family operated a number of boats on the canal.刘易斯一家在运河上经营着几艘船。
operation
n.操作，经营;手术;(军事)行动;运算
a heart bypass operation心脏搭桥手术
operational
a.运转的，即可使用的;操作上的
The boat should be operational by this afternoon.今天下午这艘船就可以使用了。
operator
n.话务员，报务员;操作员
Hello, operator? Could you put me through to Room 31?喂，接线员吗?请帮我接 31 号房间。
