know better than 雅思

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

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。

2.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城保护员了，那就说明城沿线的人们保护城的意识已经到了相当高的境界了，人为城的现象再也没有了。