only to 结果却 only too 非常

The police hurried to the spot,only to find that the damaged car had been taken away.

警察急忙赶到现场，结果发现被毁的汽车已经被人拖走了。

He got to the station,only to find the bus had gone.

他到了车站，结果发现汽车开走了。

I was only too pleased to help.

我很乐意帮忙。

Children are difficult as we know only too well.
孩子都很难对付，就像我们知道的。