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.

经过几次解释后，她开始理解这个概念了。

After several explanations, she began to ___catch ___on to the concept.

新政策很复杂，所以许多员工都在努力理解。

The new policy is complicated, so many employees are struggling to ___catch ___on.