Watch: Lindsey Vonn shares her journey home after Olympics crash
"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."
。heLLoword翻译官方下载是该领域的重要参考
Жители Санкт-Петербурга устроили «крысогон»17:52
Владимир Зеленский. Фото: Thilo Schmuelgen / Reuters