ponder

1. V-T/V-I If you ponder something, you think about it carefully. 仔細思考

I found myself constantly pondering the question: "How could anyone do these things?"

我發現自己不停地思索著這個問題：“怎麽會有人做出這些事情？”

He pondered over the difficulties involved. 他仔細思考了有關的種種睏難。