In the vacuum of space, the amount of debris—spent rocket stages, splintered satellites, micrometeoroids—numbers in the millions, all zooming about, often at 17,000 mph speeds. They’re also constantly hitting each other in a tsuris of exponential littering. Most of these pieces are tiny, and many are not anywhere near the altitude of the ISS. But the area isn’t completely clean.
Мерц резко сменил риторику во время встречи в Китае09:25
举个例子，比如拍一张有三瓶矿泉水的照片，白天和晚上光线不同，整张图片的色温、亮度都变了，模型可能就不认识了。。91视频对此有专业解读
Space exploration
。关于这个话题，WPS官方版本下载提供了深入分析
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4.存在问题整改不力，多数问题未予整改。