to ponder
陷入沉思
be deep in thought
打断沉思
break a train of thought
他沉思了好久，不知如何是好。
He pondered it for a long time and still didn't know what to do.
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。