a hard knot

• 死结

a hard knot的用法和样例：

例句

1. It's hard to loosen a fast knot.
   死结很难解开。
2. The book contains ancient fable, who can solve the high-singular knot Golding, will become Asia's King.
   古代寓言书中载，谁能解开奇异的高尔丁死结，谁就成为亚洲王。