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。

youdao

Counting prevents fights from escalating because by the time I'm done, I either forget why I am mad or I realize that what I'm angry about is unimportant.

丽洛说，“数数能够防止争吵加剧，因为数完数，我往往忘了我发火的原因，要么就能意识到惹本人生气的不过是鸡毛蒜皮的小事。”

youdao