业务接口模式不是避免远程对象设计中不匹配的方法的唯一方法。
Note that the Business Interface pattern isn't the only way to get around mismatched methods in remote object design.
如果不涉及到内嵌函数，这个作用域链是唯一引用到调用对象的。
When no nested functions are involved, the scope chain is the only reference to the call object.
如果不涉及到内嵌函数，这个作用域链是唯一引用到调用对象的。
When no nested functions are involved, the scope chain is the only reference to the call object.
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