讲解文本：
be asleep at the switch 失职
switch 开关，岔道
The new man was asleep at the switch and the two trains crashed.
新来的人疏忽职守没有扳道而使两列火车相撞了。
He got fired for falling asleep at the switch.
他因為失职被开除了。
疯狂练习吧!
