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;

youdao

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;

youdao