Thus, the disc begins its existence with a steep metallicity gradient, like the one in the distant galaxy in Leo.
因此，主盘在形成伊始有一个很大的丰度梯度，就像遥远的狮子座里的那个星系那样。
"All observations beyond our galaxy are obscured by the disc of the Milky Way," he points out, so we need to be careful how we interpret them.
“所有在我们银河系更远处的观察研究都会因银河系的断开而变得难以解释”，他指出，所以怎样来解释它们，我们需要谨慎小心。
Similar to the Milky Way Galaxy, the main components of M31 are nucleus, bulge, disc and halo.
的翻译是：类似于银河系的主要组件是核心的m31，凸块，光盘和光环。
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