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be lost in
埋头于，沉溺于，迷失在……中
This phrase means that someone is very addicted to doing something.
这个短语指的是某人非常投入于做某事，无法自拔。
My mother is lost in the TV series again.
我妈妈又沉浸在电视剧中了。
Every time I listen to that song, I will be lost in it.
我每次一听到那首歌，都会沉溺于其中。