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却步：不敢前进，向后退。形容事物可怕或讨厌，使人一看就往后退缩。
[shrink back at the sight of (sth.dangerous or difficult);flinch] 观看了一下就停步不前了。比喻在艰难险阻面前畏首畏尾,不敢勇往直前
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