But it's not just what goes up that matters;what comes down is unique.

问题描述:

But it's not just what goes up that matters;what comes down is unique.
Ben Nevis is the highest of all British mountains,and reaching its 1343-metre top is a challenge.But it’s not just what goes up that matters; what comes down is unique.2012年重庆高考题。麻烦再帮忙分析这个句子的主谓宾。

有语境吗?句子不难,问题是两个what具体指什么
但是重要的不仅仅是“上升的”,“下落的”同样是不寻常的
那你自己看看全文,上升/下降的是什么东西