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12 天
太空电梯:我们离真正的太空旅行是否更近了?
这年头,上太空已经不是啥新鲜事了,科技进步那是杠杠的。但要想来一趟说走就走的星际旅行,还得费老大劲。这不,科学家们又开始琢磨新花样了——太空电梯,听着就很高大上有没有?
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