... n.伪装行动,尾随监视行动,隐蔽行动 topographic shadowingn.地形阴影 control rod shadowing控制棒荫蔽酌 ...
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This astronaut photograph was taken at approximately 7:45 a.m. local time, when the Sun was still fairly low above the horizon, leading to shadowing to the west of topographic high points.
这张卫星图片大约在当地时间早上7:45拍摄，这时太阳依然停留在地平线以下，从而我们可以看到，该地的地形外廓被投影到其高地的西侧。
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