"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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國際勞工組織（ILO）的強迫勞動指標共有十一項，包括惡劣的生活與工作條件、過度加班、拖欠工資、恐嚇與威脅、身體或性暴力、債務束縛，以及限制行動自由等。，推荐阅读夫子获取更多信息
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