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blind as a bat ------ 睁眼瞎(成语)
英文释义
(IDIOM) Completely blind; unable to move safely.
例句
Without my glasses, I am blind as a bat, so I have two pairs in case I lose one of them.
不戴眼镜,我就成了睁眼瞎,所以我有两副眼镜,以防其中之一丢失。