例如，每个文档都包含一些标准关键词，例如日期和主题描述。
For example, each document contains several standard keywords, such as date and subject description.
这个定义中有三个关键词：简化、描述和帮助。
The three keywords in this definition are simplified, description, and assist.
通过你的形象描述，包括相关的关键词alt标签。
Describe your image via the ALT tag, including relevant keywords.
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。
Description which describes the time and reasonable on the key words repeated once or twice.
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