BPMN有两类重复活动，称作循环(DoWhile)和多实例(ForEach)。

BPMN has two types of repeating activities, called looping (DoWhile) and multi-instance (ForEach).

youdao

重复第4步创建第二个类。

Repeat step 4 to create a second class.

youdao

为所有类声明这些构造函数可能是乏味的，但是我们在《第4章- Traits》中探索的技巧可以帮助我们减少这样的重复。

Declaring all these constructors in each class could get tedious after a while, but we explored techniques in Chapter 4, Traits that can eliminate repetition.

youdao