If you took the opposite vector field that contracts everything to the origin that will have negative divergence.
如果每点处取负的向量的话，就会得到负的散度了。
But it could be that, well, imagine that my vector field accidentally goes in the opposite direction then this part of the curve, while things are flowing to the left, contributes negatively to flux.
的确有可能出现往两个方向流动的情况，可以想象到，这一小部分往相反方向流动，当流体向左流时，就只能算作负值了。
This value can be negative to extrude in the direction opposite the Face object's normal vector.
这个值可以为负，从而在Face对象的法向量的反方向上挤压。
The article by several opposite examples illustrated the former method of finding vector groups maximum linearly independent vector group is imperfect, sometimes even lead to wrong results.
构造并证明了线性无关向量组的一个充分条件，给出了求极大无关组的一个简单可行的新方法。
P-wave displacement is a polar vector, and its direction remains unchanged when we move it from right hand coordinate system to left hand coordinate system(or in the opposite way).
纵波位移是极向量，在坐标系由右手坐标系变成左手坐标系（或相反）时，不改变位移方向；
P-wave displacement is a polar vector, and its direction remains unchanged when we move it from right hand coordinate system to left hand coordinate system(or in the opposite way).
纵波位移是极向量，在坐标系由右手坐标系变成左手坐标系（或相反）时，不改变位移方向；
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