老虎和狮子同属猫科动物。

The tiger and the lion are ___congeners in the cat family.

这种药物在体内代谢时会产生几种有害的同类化合物。

This drug produces several harmful ___congeners when metabolized in the body.

这种新型电动汽车是传统燃油车的对应产品。

This new electric vehicle is a ___counterpart of traditional gasoline cars.