一旦我们做出了选择，同时也就可以定义通量积分。

Now, once we have made a choice then we can define the flux integral.

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有两种选择，当你要建立通量的积分时,就必须取定曲面的正向。

There are two choices. Basically, whenever you want to set up a flux integral you have to choose one side of the surface.

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受访者也被问到，他们是否愿意花更多的钱选择入住一家特定的酒店，并获得额外的积分作为回报。

Survey participants were also asked if they would choose a specific hotel even if they knew it was more expensive than the next, but would accrue them personal loyalty points.

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