It's hardly surprising his ideas didn't catch on
他的想法没有被广泛接受，这并不足为奇。
At first I didn't catch on, then I suddenly saw the light.
始而不解，继而恍然。
It took me a blue moon to catch on to the directions.
我花了很久才弄明白说明书的意思。
The catch on this door is broken.
这扇门上的吊扣坏了。
The hook which he had thrown did not catch on the rocks, and dropped back to the ground.
他甩出去的钩子没挂住石头，又落回到地面。