"When you regain these core competencies and you start exercising your muscles, your skills do not atrophy," he said. "It's safer. And yes, you are buying down risk, because you're able to test things in low Earth orbit before you need to get to the moon, which is exactly what we did during the Apollo era."
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。下载安装 谷歌浏览器 开启极速安全的 上网之旅。对此有专业解读
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Let’s start by defining a couple types. First, our value type: