peace of mind
内心的宁静
例句与用法：
It was an unkind, stupid thing to say and she will have no peace of mind until she's apologized and been forgiven.
说起来这是件不客气且愚蠢的事。除非她道歉并得到谅解，否则，她的心灵将是无法安宁下来的。
For my own peace of mind I must go back home and check that I locked all the windows.
我得回家去看看窗户是否都关好了，这样我才放心。
I shall be glad when the last of my daughters is married off, then I might have some peace of mind.
等我的最后一个女儿出嫁时我会高兴的，因为到那时，我也许会享受到一点安宁。
The murderer never recovered his peace of mind.
这个杀人凶手心里再也没平静过。