百里深情不及她人笑
[băi lĭ shēn qíng bù jí tā rén xiào]
Directly translates to 'Even sincere feelings spread across a hundred miles pale beside someone else’s laugh'. This conveys a poignant feeling where even the most devoted affection can seem insignificant when set against the joy that someone else's smile brings. It speaks of comparing heartfelt devotion to fleeting moments of joy found in another person's laughter, highlighting emotional complexity and sometimes painful realizations.