关于turn
1.turn on
打开;发动
Will you turn on the radio?
你打开收音机好吗?
2,turn off
关掉
Turn off the light before you leave.
离开前请把灯关掉。
3,turn up
出现,露面
eg: He didn't turn up at the meeting yesterday.
出现;发生
Something unexpected has turned up.
发生了没有意料到的事情。
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