They can even add key words of interest, such as "water", "violence" or "UN".
他们甚至可以添加感兴趣的关键字，比如“水”、“暴力”或者“联合国”。
Then, you can select key words of the title, subject or general as you like.
你可以选择题名、主题词或通用关键词等途径。
Each answer should have no more than four or five key words.
每份答案应该不超过四个或五个关键字。
Description which describes the time and reasonable on the key words repeated once or twice.
Description里面描述的时候，合理的对关键词重复一两次。
Description which describes the time and reasonable on the key words repeated once or twice.
Description里面描述的时候，合理的对关键词重复一两次。
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