<书>therein
个中自有原因。
There is some reason behind it.
个中况味，只有过来人才能理会。
Only people who have actually experienced it can understand how it feels.
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。