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。
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。
系上鞋带，解开鞋带。
你鞋带没系好。
你鞋带没系好。
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