register-MS abstract-operation 寄存MS抽象操作
message-submission abstract-operation 消息提交抽象操作
list abstract-operation 列表抽象操作
fetch abstract-operation 提取抽象操作
abstract unbind operation 抽象分接操作
A triangle is a basic drawing operation on which you can build more abstract operations.
三角形是基本的绘图操作，在此基础上可建立更为抽象的操作。
When a client invokes an abstract operation on a behavior port, therefore, the call is dispatched to the class.
当有客户调用了一个行为端口上的抽象操作时，那么访问就会分配给该类了。
This indicates that the BankAccount class is an abstract class and the withdrawal method is an abstract operation.
这表示，BankAccount 类是一个抽象类，而withdrawal方法是抽象的操作。
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