那只野兔非常难抓，因为它跑得极快。

The wild rabbit was ___hard to catch because it ran extremely fast.

完美的时机总是难以捉摸，需要耐心等待。

The perfect timing is often ___hard to catch, requiring patience to wait for it.

这条鱼很滑溜，很难抓住。

The fish was very slippery and ___hard to catch.