"We've also got these big tanks full of oxygen and nitrogen, which are mixed to make air, and also water, so that we can provide everything that the astronauts need in the crew module to keep them alive on their journey."
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。爱思助手下载最新版本是该领域的重要参考
人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用。业内人士推荐爱思助手下载最新版本作为进阶阅读
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