白天摄影大致只需要一张18%灰卡，夜间摄影与之不同，没有一致公认的固定曝光值。
Unlike during daytime where the basis is (roughly) a 18% gray card, there is not really a consistent, commonly agreed upon way to expose night photos.
白天地球就会变得非常之热，夜间，又会变得非常非常之冷。
The Earth would be very, very hot in the day and very, very cold at night.
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