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宇宙是个谜,“黑洞”是其中一个,天文学家肯定了它的存在,可是,“黑洞”仍有太多未解的东西,还待揭开。
The universe is a mystery. “Black hole” is one of them. Astronomers have affirmed its existence. However, there are still too many unsolved things in the “black hole” and yet to be opened.