但是在我们对超类所知的一切只限于它是类型参数的实例化时，对于什么样的构造函数可用于给定的实例化，我们没有任何概念。
But when all we know about our superclass is that it's some instantiation of a type parameter, we have no idea what constructors will be available for a given instantiation.
你需要了解哪个服务被调用，调用者是谁，以及使用了什么样的参数。
You need to recognize which of your services are called, by whom, with what kind of parameters.
在我们希望允许类继承类型参数时立即出现的紧迫问题是要决定我们能调用什么样的超级构造函数？
An immediate and pressing problem that arises as soon as we want to allow for classes that extend a type parameter is to decide what super-constructors are we able to call?
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