The US space agency has released a "pre-solicitation" for what is expected to be a hotly contested contract to develop a spacecraft to orbit Mars and relay communications from the red planet back to Earth.
20+ curated newsletters。关于这个话题，safew官方下载提供了深入分析
Фото: James Lang / Imagn Images / Reuters，详情可参考旺商聊官方下载
SelectWhat's included