The scientists were already investigating the problem of pollution from space debris when they realised a SpaceX Falcon 9 had failed in flight.
Фото: Tatiana Meel / Reuters
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Software Freedom Conservancy sfconservancy.org🇺🇸
一个个水果新品种从“高价尝鲜”变成日常消费品，表明消费升级不只在购买力更强，也在供给侧更优