Actually, what is implicit in this explanation is that I am counting positively all the stuff that flows across C in the direction of n and negatively what flows in the opposite direction.
以上的解释实际默认了,把沿着n方向流过C的,都算作正值,相反方向的，算作负值。
Actually, what is implicit in this explanation is that I am counting positively all the stuff that flows across C in the direction of n and negatively what flows in the opposite direction.
以上的解释实际默认了,把沿着n方向流过C的,都算作正值,相反方向的，算作负值。
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