Create a derived class inherited from the predefined grammar class.

创建一个从预定义grammar类继承而来的派生类。

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Suppose you have a derived class D whose base class B has implemented some interfaces.

假设有个类型D，它的基类B实现了某些接口。

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Setting them again for each derived class is a waste, since they would be available anyway by inheritance.

为每个派生类再次设置这些属性是一种浪费，因为通过继承它们就会拥有这些属性。

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Kosan is in early human trials of epothilone-D, a potent variant of a promising new class of chemotherapy drugs derived from an African soil bacteria, Sorangium cellulosum.

FORBES: Innovators