By comparison with these familiar yardsticks,the distances to the galaxies are incomprehensibly large,but they too are made more manageable by using a time calibration,in this case the distance that light travels in one year.
与这些熟悉的尺度相比,到太空的距离远得难以理解,但它们也通过使用一个时间的标尺而变得更加容易对付了,在这种情况下是光在一年内走过的距离。
分句1:the distance…
分句2:but they too
分句3:that…
1和2并列
2和3嵌套
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