这里不是说只有一个黑洞,而是有省略: Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and of many of the 100 billion other galaxies estimated to exist in the universe. 如果扩展后,就是这样的: Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and [that a black hole lies at the center] of many of the 100 billion other galaxies estimated to exist in the universe. 扩展部份仍然用 a black hole 是因为每个银河系里面只有一个黑洞,而不是有几个。 -- by 会员 edwardelric (2010/2/19 8:46:15)
嘻嘻为啥每个系只有一个黑洞?个是个啥度量单位哦? |