He is very quick to catch on to things.

　　他領悟能力很強。

　　Wait a minute! I'm beginning to catch on.

　　等一下！我開始有點懂了。

　　Eddie slipped the safety catch on his automatic back into place.

　　埃迪將自動步槍的保險栓重新拉上。

　　It's hardly surprising his ideas didn't catch on

　　他的想法沒有被廣泛接受，這并不足為奇。

　　At first I didn't catch on, then I suddenly saw the light.

　　始而不解，繼而恍然。