to avoid dealing completely with something or to fail to pay enough attention to it

Providing homeless people with somewhere to stay when the weather is cold only skates around the problem, it doesn't solve it. 只在天冷的时候为无家可归者提供住处，这只是治标不治本的做法，并不能真正解决问题。

I didn't understand what the teacher said about prepositions, because she only skated over it. 我不明白老师所讲的关于介词的内容，因为她只是一带而过讲了一下。