P1 Astronomers and scientists think that a black hole is a region of space into which matter has fallen and from which nothing can escape.
天文学家和科学家认为黑洞是一种空间区，物质可以掉进黑洞但任何物质不能逃脱。
P1 Astronomers and scientists think that a black hole is a region of space into which matter has fallen and from which nothing can escape.
天文学家和科学家认为黑洞是一种空间区，物质可以掉进黑洞但任何物质不能逃脱。
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