事实上，在相反的方向，两次计算了这些通量。
So, in fact, you'll be summing the flux through these guys twice with opposite orientations.
任何两次计算结果都不相同，但当这些结果综合在一起后，它们就组成了一幅合理的图画，描绘了人群在烟雾下的暴露情况。
No two iterations of the simulation might be identical, but collectively they build up a realistic picture of the population’s smog exposure.
跟那些在经济危机扩散之时财务状况会变得岌岌可危的债券保险公司做对冲避险生意时，摩根大通都会做两次计算分析：第一次假设避险成功的情形，再一次则假设所购对冲工具变的一文不值的情形。
Hedging through bond insurers, whose finances grew shaky as the crisis spread, was calculated twice: once assuming the hedge would hold, and again assuming it was worthless.
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