be deep in thought meaning in English

潜神默思
在沉思

Keep quiet. father is deep in thought .
安静些，爸爸在沉思。
It seemed to me that you were deep in thought
看起来似乎你正在陷入沉思
He is deep in thought
他陷入沉思
He had been deep in thought since he left the last station , and still went on thinking of the same thingof something so important that he did not notice what was passing around him
他在前一站就已陷入沉思状态中，还在继续想到一桩如此重要的事情，以致于丝毫没有注意他周围发生的一切。