The children became silent and thoughtful.

　　孩子們變得沉默并思考著。

　　Colin's face was thoughtful and appreciative.

　　科林滿臉的沉思和賞識(shí)。

　　That sounds wonderful and very thoughtful of you.

　　這聽(tīng)起來(lái)很棒。你想得真周到。