You can then use the base class, or any of the subclasses, in methods that are typed to expect the base class as a method argument.

然后您就可以在键入的以基类作为方法参数的方法中使用基类或任何一个子类。

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The study's method was to analyze a mountain of published, peer-reviewed psychology papers. It found evidence both of a narrow research base and of the eccentricity of that base.

这项研究通过分析巨量的出版过的，同行评鉴过的心理学论文，找到了证据可以证明研究对象样本的狭小和这个样本群的反常之处。

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If the method is defined only in base class then it will invoke base class method irrespective to the object you are passing.

如果方法是定义在基类然后它会调用基类方法不论你是对象传递。

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It can be caused by a number of factors, including a rapid increase in the frequency of training, sudden increase in the intensity of training, transition from one training method to another, genetic abnormalities of the knee joint and poor base strength of the quadriceps.

BBC: Hargreaves faces career concerns