再提一次，那是因为一个泛型类可以用其自己的类型参数来实例化另一个泛型类。

Again, that's because one generic class may instantiate another with its own type parameters.

youdao

再提一次，那是因为一个泛型类可以用其自己的类型参数来实例化另一个泛型类。

Again, that's because one generic class may instantiate another with its own type parameters.

youdao