以下为句子列表：
英文: The mystery arises when one considers how a spiral galaxy rotates.
中文: 当人们考虑旋涡星系是如何转动的时候难题就来了。
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英文: Though the details are still not clear, it seems that the growth of the black hole is intimately related to the growth of the spheroidal component - an elliptical galaxy, or the bulge of a spiral galaxy - in which it lives.
中文: 虽然细节仍然不清晰,好象黑洞生长与类星体生长密切有关-一个椭圆的星系,或螺旋形的星系-它在里面的星系凸起。
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