1 PREFIX (加在动词之前)表示“否定”,“相反” De- is added to a verb in order to change the meaning of the verb to its opposite. (加在动词之前)表示“否定”,“相反”
2 PREFIX (加在名词之前构成动词)表示“除去”,“除掉” De- is added to a noun in order to make it a verb referring to the removal of the thing described by the noun. (加在名词之前构成动词)表示“除去”,“除掉”