与他人断绝来往
闭关自守, 采取了孤立主义

turn in on oneself turn upon turn one's back upon throw oneself upon bring contempt upon oneself cast oneself upon bring ruin upon oneself avenge oneself upon fling oneself upon take upon oneself fasten oneself upon turn oneself in take upon oneself throw oneself upon bring ruin upon oneself value oneself upon turn one's back upon turn in turn-in in turn turn oneself into an expert close in upon thrust oneself in