know better than 雅思

He should have known better than to leave her for that young girl. Hell hath no fury like a woman scorned.

他早该知道能为了那个年轻女孩离开她，女人醋意大发时太可怕了。

It seems unnecessary to have watchmen like me on the Wall in the future when people along the Wall know better than to further vandalize the rampart.

过，照现在的形势来看，我觉得将来最好是再需要设我们这样的长城保护员了，那就说明长城沿线的人们保护长城的意识已经到了相当高的境界了，人为破坏长城的现象再也没有了。