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

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
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。

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
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

但是并不是上升（增加）的那部分很重要，下降的那个才是特别的。

重要的不只是正在发展的事物，正在衰竭的事物也具有其特点。