The idea has been around for ages without catching on.这一想法很久以来一直存在, 但没有流行起来。

The fashion has yet to catch on in Australia.这一潮流在澳大利亚尚未风行。

The idea is catching on.这一概念开始流行了。

Wait a minute! I'm beginning to catch on.等一下！我有点明白了。

He'll catch on eventually.他最终会理解的。

He hasn't really caught on to the system.他还没有真正认清这一制度的本质。

He got what he could out of me before I caught on to the kind of person he'd turned into.他从我这里达到目的后我终于明白了他变成了什么样的人。