The Hello object has no method or member object called world, so the world portion of the URL is passed in as a positional argument to that object's default method.

对象Hello没有叫做world的方法或者成员对象，所以这个URL的world部分作为那个对象的default方法的位置参数被传递进来。

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The caller has no need to access other properties, methods, or interfaces on the object implementing the method.

目标函数对调用者的内部属性、方法等不关心。

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An interface reference or a delegate can be used by an object that has no knowledge of the class that implements the interface or delegate method.

即使不知道实作介面或委派方法的类别，物件仍然可以使用介面参考或委派。

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