solve的名词是什么

例句：

The problem can be solved in all manner of ways.

这个问题可以用各种方法加以解决。

She tried her best to solve the problem.

她尽了最大的努力解决这个问题。

Attempts are being made to solve the problem of waste disposal.

正在想办法解决废物处理的.问题。

This won't solve the problem but it's a step in the right direction.

这虽不能解决问题，却是朝正确方向迈出的一步。

It is questionable whether this is a good way of solving the problem.

这未必是一个解决问题的好办法。