turn in on oneself

• 与他人断绝来往,闭关自守,采取了孤立主义

turn in on oneself的用法和样例：

例句

1. A closed economy will not put a country on the way to prosperity.
   闭关自守的经济不会使一个国家富起来。
2. However, while relying on our own efforts, we should not close our doors but seek friends everywhere.
   主要靠自己，同时不要闭关自守，可以多方面找朋友。