1·The key thing about these externalised interactions and behaviours is that they represent the business-meaningful stuff that must happen for some part of a business activity to proceed or complete.
关于这些外部化的交互与行为，关键之处在于它们表示的是对业务有意义的东西，它们若不发生，业务活动的某部分就无法继续或完成。