Make a hard knot.

打一个结实的结。

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Most Americans still believe that the interplay of schools and culture is a complex and hard-to-untangle knot.

大多数美国人仍相信学校和文化的相互作用是一个复杂而难解的结。

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Ronnie swallowed hard. He'd just started developing an Adam's apple, and he could feel the knot pogo in his throat. He stopped walking.

罗尼艰难地咽了一下，感觉自己就好像亚当要去偷食苹果，他觉得喉咙里有结节蹦来蹦去，于是停下脚步。

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