The strap is too loose. Tighten it up a bit.
带子太松了，再勒一勒。
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。
Of the ones that do up the strap, about half have them so loose that they can put-on and remove the helmet without unbuckling.
带子扣上的人又有一半的带子太松，以致于不用动扣子就可以把安全帽戴上或取下。
Your strap is too loose, just fasten it.
你的皮带松了，把它扣紧。
Your strap is too loose, just fasten it.
你的皮带松了，把它扣紧。
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