This is called a covariant return type.

这就是所谓的协变返回类型的方法。

Thewhole procedure used is generally covariant.

整个讨论过程具有广义协变性。

And while IList isn't covariant, a read-only list interface would be.

即使IList接口不是协变的，一个只读列表接口也理应如此。

The covariant equation of plane motion body in curved space-time is studied.

研究弯曲时空中平面运动刚体的动力学协变方程。

The result shows that there exists a class of optimal phase-covariant quantum cloning.

结果表明存在一类最优相位协变量子克隆。