A letter sent home by a person living or traveling away, assuring their family of their safety and well-being; a letter reporting one's peaceful state to family.
每次远行，他都会及时寄回平安家书，让家中的父母安心
Every time he traveled far, he would promptly send back a letter reporting his safety, putting his parents' minds at ease at home.
Era:
Ancient
Frequency:
Story:
In the Song Dynasty, Zhu Xi recorded a story in his 'Records of Famous Officials' Words and Deeds in Five Dynasties'. A scholar named Hu Ding'an was studying on Mount Tai and had not returned home for ten years.
His family entrusted someone to send him a letter. Upon reading the letter, he found only two characters: '平安' (peace and safety). He immediately threw the letter into a mountain gully, stopped his studies, and rushed back home.
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