Adversity is a good schoolmaster.是什么意思？

Adversity is a good schoolmaster.

逆境为良师。

adversity

n. 逆境，不幸，灾难；

例句
I always turn adversity and defeat into victories, but it's probably put ten years on me.
我总是能够扭转逆境，反败为胜，但这可能让我显得老成了10岁。

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

good

adj. 好的，优秀的，有益的，漂亮的，健全的；n. 好处，利益，善良，善行，好人；adv. 同well；

例句
This recipe makes a good accompaniment to ice-cream.
这道食谱适合搭配冰激凌。