您可能只扩展一个类并继承其方法实现。

You may only extend a single class and inherit its method implementations.

youdao

我们只在老鼠身上实验成功，还需要扩展到其他的动物样本上——雪貂和豚鼠。

We only showed it in mice, so one has to extend this to other animal models—the ferret and the guinea pig.

youdao

扩展只瞄准整体转换的一个部分。

An extension targets just one part of the overall transformation.

youdao