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black out 做动词讲是什么意思啊?

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black out 做动词讲是什么意思啊?
lack out
vt. 用墨等涂掉(熄灭灯光,眼前发黑,查禁)
black out
phr. v.
1.to become unconscious = faint, pass out
例句:For a few seconds, he thought he was going to black out.

2.black sth. out
(1)to put a dark mark over something so that it cannot be seen
例句:The censors had blacked out several words.
(2)to hide or turn off all the lights in a town or city, especially during wa