So there's reason to believe that we will get an answer to that piece of the puzzle oneday.

问题描述:

So there's reason to believe that we will get an answer to that piece of the puzzle oneday.
that piece of放在这里有什么意义?

不能去掉.puzzle通常是一整副里有很多块的,而这里will get answer的只是其中的一块.也就是说,现在可能很多问题都解决了,但有些问题还没有.如果去掉,含义就不同了