生命中令人悲傷的一件事是

A sad thing in life is when you meet someone who means a lot to you，only to find out in the end that it was never meant to be and you just have to let go. 生命中令人悲傷的一件事是，你遇到了一個對你來說很重要的人，但卻最終發現你們有緣無份，因此你不得不放手。