The object can generate process instance specific data, such as process name, current activity, current logged in user, and the current instance ID.

该对象能生成进程实例特定数据，比如进程名称、当前活动、当前登录用户以及当前实例 ID。

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The id field, an integer that starts at 100 and is automatically incremented, is created as a unique identifier for this instance of the data.

id 字段是从 100 开始并自动递增的整数，创建此字段是为了将其用作该数据实例的唯一标识符。

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If a Book instance has data in its authors property, you need to store those authors through the ID of each author.

如果Book实例的authors属性有数据，需要将这些作者通过ID存入数据库。

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