Simone
"释怀" 两个字非常简洁，
英语没有单词可以充分表达其含蓄的意思，
准确的翻译要看语境。
下面是几个可能的翻译：
to get over sth.
to stop thinking/worrying about sth.
to not be hung up over sth
例：
唯一不能让我释怀的是我的女儿
The only thing I can't get over with is thinking about my daughter
同事意见不合时要能轻易释怀
You should not be hung up over your differences with colleagues at work
