标题: og12 117 今天被他们弄晕了 [打印本页] 作者: zhangzaza 时间: 2011-1-26 14:50 标题: og12 117 今天被他们弄晕了 关于星系的这篇文章，完全晕，求翻译： it has been known for some time that outside the bright nucleus of a typical spiral galaxy luminosity falls off rapidly with distance from the center . 还有文中的mass是什么意思，具体一点，特别是117题weaken，从何下手？能稍微给我解释下不作者: hutengqi 时间: 2011-1-26 20:20
It has been known (for some time) that(outside the bright nucleus of a typical spiral galaxy)luminosity falls off rapidly with distance from the center.