deep musing 沉思
lost in musing 陷入沉思
quiet musing 宁静的冥想
A: You've been so quiet today. What's on your mind?
A：你今天一直很安静。你在想什么呢？
B: I'm just lost in musing about my childhood memories.
B：我只是在沉思关于童年的记忆。
1) 沉思
2) 冥想
3) 深思
1. 沉思，冥想
noun
1. the act of thinking about something deeply and quietly