他花了一段时间才理解我们的意思。

It took him a while to ___catch ___on to what we meant.

经过几次解释，她终于明白了那些微妙的暗示。

She finally ___caught ___on to the subtle hints after several explanations.

这个概念很复杂，但大多数人只要有足够的练习最终都会理解。

The concept is complex, but most people will eventually ___catch ___on with enough practice.