协变和逆变的区别对于张量的计算尤为重要，这往往会出现混合方差。

The distinction between covariance and contravariance is important for computations with tensors, which often have mixed variance.

youdao

从而可以得到不同扩散张量的适用范围。

Accordingly, the applicable range for these diffusion tensors is acquired.

youdao

而复合介质的电介质张量的计算相当复杂。

It is rather complicated to evaluate the dielectric tensor of composite media.

youdao

And that generally is just given by the heat capacity the calorimeter times delta T, right.. Because the heat capacity of the calorimeter just like this thing is not strongly temperature dependent, OK.

一般它就由量热计的热容,乘以ΔT给出，因为，量热计的热容,就像这张桌子一样,并不强烈依赖于温度。

麻省理工公开课 - 热力学与动力学课程节选