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。

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After careful analysis they found the clear signature of an object located within the gap in the dust disc, about one billion kilometers from the star.

在仔细分析后他们发现了明显的迹象，表明在尘埃盘的裂口处有一个物体，距离恒星大约十亿千米。

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Of the 20 women she has tested so far, only one was able to instantly and accurately identify the red-green disc each time.

在她目前为止测试过的20位妇女中，只有一位可以每次都即时准确的识别出红绿盘。

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No one knows exactly where disc golf started, but some credit it to a group of school children in Vancouver,Canada.

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