NEW YORK, June 6 (Xinhua) -- Elon Musk's threat, which he later retracted, to cut off NASA's use of SpaceX's Dragon spacecraft would be a huge blow to NASA, depriving the space agency of the only Amer ...

世界正在亲历这一切，而这一点都不好看——唐纳德·特朗普（Donald Trump；川普）和埃隆·马斯克（Elon Musk）各自手执最大的扬声器，如今他们互相喊话。两人的分歧已经升级成一场口水战。

"For Musk, a prolonged feud with Trump could be hugely expensive," noted the report. His companies, including SpaceX, have benefited from billions of dollars in government contracts and were ...

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近视，一直是一个世界性难题。如今，不想戴眼镜、只想通过“近视手术”来告别近视的人越来越多。在我国，近视手术（学名“角膜屈光手术”）从无到有，已有30多年的历史。很多人在做近视手术之前，有很多担心：做完近视手术后，会不会有后遗症？会不会眼瞎或者近视反弹 ...