Because calculations and lab experiments replicating the Venusian surface and atmosphere show that emissivity decreases over time, emissivity can be an important indicator of a substance's age.
同时因为计算与实验室的实验复制的金星地表与大气层的活动，表明辐射率一直在下降，所以辐射率能够成为某个地质年代的一个重要指标。
It was only possible to detect the length of the Venusian day by radar as the clouds entirely engulf the surface.
这是只可能检测为云雷达对金星一天的长度完全吞噬的表面。
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