一个实例操作所有一个数据库表或视图的业务逻辑。

A single instance that handles the business logic for all rows in a database table or view.

youdao

模拟实例级操作(没有用户ID和密码)的本地授权测试。

Simulate the testing of the local authorization for an instance-level operation (without the user ID and password).

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外部变量允许业务过程变量可见，并可以直接在过程实例之外操作。

External variables allowing business process variables to be visible and directly manipulated outside process instance.

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Notice that that typically also defines for me what the internal variables are, what the internal characteristics of the class are going to be.

就放进去是比较好的,我写下了init声明意思就是，当你创建一个实例的时候,这就是你要进行的操作。

麻省理工公开课 - 计算机科学及编程导论课程节选