复合备忘单由任务组成，每一个任务代表一个备忘单。
A composite cheat sheet consists of tasks, where each task represents a cheat sheet.
一个任务代表一个备忘单，并使用task元素实现。
A task represents a cheat sheet and is implemented using the task element.
这四种信息类型(主题、概念、任务和引用)代表了技术文档团体中使用的基本内容类型。
The four information types (topic, concept, task, and reference) represent the primary content categories used in the technical documentation community.
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