As usual, he confined his comments to generalities.

他和往常一样，只作了笼统的评论。

He avoided this tricky question and talked in generalities.

他回避了这个非常微妙的问题，只做了个笼统的表述。

I'll start with some generalities and then examine a few specific examples.

我首先进行概述，然后会分析几个实例。

He's fond of dealing in generalities.

他老是喜欢搞些抽象的概念。

Just a few hopefully helpful generalities.

只是一点点希望有帮助的概括罢了。