to have one's mind set at rest
知道儿子平安无事后，父母心里才一块石头落地。
Only when they knew that their son was safe were the mother and father's minds set at rest.
汉译英翻译词典收录86165条汉英翻译词条，基本涵盖了全部常用中文字词的英语拼写、翻译、音标、读音、用法、例句等，是英语学习的有利工具。