They try to provide us some guidance about words that are considered slang or informal or offensive, often through usage labels, but they're in something of a bind, because they're trying to describe what we do, and they know that we often go to dictionaries to get information about how we should use a word well or appropriately.
他们努力给我们提供关于 那些被认作俚语或非正式词汇的 或者那些令人反感的词条的一些指导， 常常通过附录的形式 但他们有时也左右为难， 因为他们尝试着描述我们的所作所为， 他们知道我们常借助字典 来得到如何 正确或者合适地使用一个词汇的信息