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The strap is too loose. Tighten it up a bit.
带子太松了，再勒一勒。
《新英汉大辞典》
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Leave the end hanging loose so you can pull it to tighten the strap.
让带子的未端突出如一个松的折角。
youdao
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Your strap is too loose, just fasten it.
你的皮带松了，把它扣紧。
youdao
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Your strap is too loose, just fasten it.
你的皮带松了，把它扣紧。
youdao