以上来源于: WordNet
Pictured above is a series of images digitally stacked so that all of the stars images coincide. Here, Mars appears to trace out a loop in the sky.
上面图是一系列数码照片叠加而成的,让恒星重合,而火星貌似在天空中画了一个环。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and then go forward in a loop. Others appeared brighter at times and less bright at others.
这样,问题就来了,因为天文学家以前发现过,天上有些行星停顿下来,往后移动,然后再成环状向前移动,而其他行星看上去有时亮些,有时又不怎么亮。
The problem arose because astronomers had noticed that some planets in the sky seemed to stop, move backward and then go forward in a loop.
这个问题也就产生了,因为天文学家已经发现有些行星在天空似乎停止,向后移动,然后在一个循环。
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