1. It is packed with phrases such as "to do the dirty", "to dish the dirt" or "dirty money" or "dirty word". 它和其它短语组合起来使用，如：“去做龌龊的事”，“散布流言蜚语”或者是“赃款”或“脏话”。
2. Drink and Dirty Water Rule: Dropping a piece of drink into dirty water, you would get a bottle of dirty water; 酒与污水定律：如果把一匙酒倒进一桶污水，你得到的是一桶污水；
3. At the contradiction of word form and word content, word form dominates word. 在词的形式和内容这对矛盾中，形式规定着词的本质；
4. Seeing a word, hearing a word, saying a word and writing a word helps to make it part of your active vocabulary. 能够识别、听懂、口、笔头运用一个单词，才能说你掌握了它。
5. In terms of category of words, it can function as notional word, such as verb, pronoun, conjunction, as well as functional word, such as auxiliary word, emotional word, etc. 在词类上，它可以是实词，做动词、代词、连词等；也可以是虚词，做助词、语气词等。
