短语讲解：

1.In general, the definition of an adverb is this: a word that describes a verb, an adjective, another adverb, or a sentence.

in general 通常; 大体上; 一般而言，总的来说
例句：I think we need to improve our educational system in general
我认为有必要从整体上改进我们的教育体系。

2.However, Americans often use okay even when they do not necessarily agree with each other.

each other 互相，彼此
例句：Do you often help each other with your lessons?
你们经常互相帮助复习功课吗？

3.It can also be used to show the end of a topic in a conversation.

be used to 习惯于，适用于
例句：This piece of cloth can be used to make a pair of pillow cases.
这块布可以做一对枕套。