a metal element
金属元素
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Executives said Tuesday they're also developing a foundry designed to produce metal parts from nickel, an element abundant in asteroids, and operate in space, and a class of "Harvestor" craft to extract valuable material from the asteroids.
CNN: 'Fireflies' to scope out space rocks for mining
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