Contact——这个接口表示AddressBook上的单个联系人。
Contact - This Interface represents a single contact on the Address Book.
参与者可以表示与您系统接口的任何事物和任何人。
An actor represents anything or anyone that interfaces with your system.
因此，我们决定将这些操作表示为两种不同的接口。
We therefore decide to represent these as two separate interfaces.
Repository 实际上是二进制类表示的源代码的接口。
org.apache.bcel.util.Repository is actually an interface for a source of binary class representations.
Repository 实际上是二进制类表示的源代码的接口。
org.apache.bcel.util.Repository is actually an interface for a source of binary class representations.
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