She noticed that all threesystems — application server, database server, and her desktop — had different times.
她注意到所有三个系统——应用服务器、数据库服务器和她的桌面——有着不同的时间。
3
Note that this figure may not exactly be pure UML, as UML is usually used to model a single system, whereas the sample application is really composed of threesystems.