As a result of the earth's rotation on its axis, the radiant energy received by any area of the earth surface from the sun varies periodically.
由于地球上任一地区接收到太阳辐射能量的周期变化，导致地球表面温度的周期性变化。
Such a surface would reflect no radiant energy, and hence would appear black in color.
这种表面不会反射辐射能，因此呈现黑色。
Clouds return radiant energy to the surface primarily via the atmospheric window.
云主要通过大气窗区向地表辐射能量。
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