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。

　　It took me a blue moon to catch on to the directions.

　　我花了很久才弄明白說(shuō)明書的意思。

　　The catch on this door is broken.

　　這扇門上的吊扣壞了。

　　The hook which he had thrown did not catch on the rocks, and dropped back to the ground.

　　他甩出去的鉤子沒掛住石頭，又落回到地面。