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2011年7月12日,美国宇航员进行了最后一次太空行走,太空站的运输任务已经结束了。由于花费巨大而收获甚微,美、俄等空大国的官方已经渐渐失去了探索外太空的热
On July 12, 2011, the astronauts of the United States conducted their last spacewalk and the mission of transporting the space station is over. Officials from the big powers such as the United States and Russia have gradually lost their heat to explore outer space due to the enormous cost and little gain