deep in thought
陷入沉思
例句与用法：
She sat there deep in thought.
她坐在那儿沉思着。
She sat, deep in thought.
她坐在那儿沉思默想。
Deep in thought and heedless of present circumstances or activities; preoccupied.
心不在焉的，茫然的陷入沉思且未注意到周围的情况或活动的; 出神的
He is deep in thought.
他陷入沉思。