It may not help you tie your shoe but that little plastic tip keeps the rest of the shoelace, the shoe string from unraveling into weak and useless threads.
它可能不能帮你系鞋带，但那小小的塑料头可以让鞋带的其余部分不会散开成脆弱无用的线。
Trevor, let me tie your shoelace.
特雷福，让我帮你把鞋带系上吧。
With a molecule you can't just grab hold of the ends and tie them like you would a shoelace. They're too small for that.
你不能像绑鞋带那样抓住分子的两端来打结，因为他们太小了。
Wait a moment. my shoelace got loose. I have to tie it.
我鞋带松我得绑我。你等我下。 翻译。
系上鞋带，解开鞋带。
你鞋带没系好。
你鞋带没系好。
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