1
be deep in thought
表示处于沉思的状态，常与 be 连用。
She was deep in thought and didn't hear the doorbell.
她正在沉思，没有听到门铃声。
沉思；深思
先理解核心含义，再看它在真实句子里的用法。
沉思；深思
deeply absorbed in one's thoughts
She was deep in thought and didn't hear the doorbell.
她正在沉思，没有听到门铃声。
She sat by the window, deep in thought, and did not notice the rain outside.
她坐在窗边，陷入沉思，没有注意到外面的雨。
He was deep in thought during the meeting and missed his colleague's question.
开会时他陷入沉思，错过了同事的问题。
Walking home, she was so deep in thought that she passed her own stop.
走回家时，她陷入沉思，以至于坐过了自己的那一站。
表示处于沉思的状态，常与 be 连用。
She was deep in thought and didn't hear the doorbell.
她正在沉思，没有听到门铃声。
与具体动作动词连用，描述进行该动作时陷入沉思。
He sat deep in thought, staring out the window.
他坐着沉思，凝视着窗外。
与系动词连用，表示看起来陷入沉思。
The professor appeared deep in thought during the lecture.
教授在讲座中显得陷入沉思。
Not this
He is deeply in thought.
Use this
He is deep in thought.
表示“沉思”时是固定短语 deep in thought，不可将 deep 改为副词 deeply。
Not this
He is in deep thought.
Use this
He is deep in thought.
固定搭配 deep in thought 中 deep 位于 in 前，不可颠倒为 in deep thought。
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常作表语或状语
Dictionary facts from ECDICT.