经典电磁理论是四维协变的，相对论时空概念的改变是根本性的改变。

The change of time and space concept of theory of relativity is right-about.

youdao

最后就是对协变和逆变的支持了。

Up last is support for Co- and Contra-Variance.

youdao

研究弯曲时空中平面运动刚体的动力学协变方程。

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

youdao

这就是所谓的协变返回类型的方法。

This is called a covariant return type.

youdao

这就是所谓的协变返回类型的方法。

This is called a covariant return type.

youdao