Since we are doing an object-oriented software system, the behavior of our use case must be carried out by the classes and objects in our system.
由于我们是在设计一个面向对象的软件系统，我们的用例行为需要由我们系统中的一些对象和类来执行。
The relationship between classes and the dynamic objects they generate allows for much flexibility in a system.
类及其生成的动态对象之间的关系使得系统更灵活。
Object diagrams allow you to model the instances of your classes (as objects) in a class diagram in order to describe the behaviour of a system.
对象图允许我们为类图中的类实例（也就是对象）建模，用来描述系统活动。
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