English-Hanzi/Black hole is a huge sky object

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A black hole is a huge sky object. It is the center of a galaxy. It is called black hole because the light around is absorbed by it and cannot escape, so we cannot see it.

黑洞是一个巨大的天体。 它是一个星系的中心。 它被称为黑洞,因为周围的光被它吸收而无法逃脱,所以我们看不到它。