如果纯量场变化缓慢，它就会有固定的大小，而且没有 方向性，就像一个常数一样；
If a scalar field changes slowly, it resembles a constant, both in its fixed magnitude and in its lack of directionality;
在这样的情况下，由于纯量场是爱因斯坦宇宙常数最简化的归纳，因此它会产生作用。
In these contexts, the fields work because they are the simplest generalization of Einstein's cosmological constant.
介绍环境流场中的动量及纯量传输，主要着重于河川和湖泊系统的探讨。
Introduction to momentum and scalar transport in environmental flows, with emphasis given to river and lake systems.
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