Europa, Ganymede, and Callisto all provide evidence of a thin atmospheric layer known as a 'surface-bound exosphere'.
二、、四被有一层很薄的大气层。
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Earth's moon, Saturn's Titan, Jupiter's Callisto, or Jupiter's Ganymede?
地球卫，土土卫六，卫四，还是Ganymede?
They're called Ganymede, Callisto, and Europa.
这几个分别叫卫三、卫四和卫二。
The next biggest moon is Callisto, at 4800 km in diameter.
第二大卫是卫四（卡斯托），直径约4800公里。
That means the surface is very old, maybe as old as Callisto itself.
这意味着它表面非常古老，可能和卫四同岁。
Callisto orbits Jupiter farthest out of the four biggies, almost two million km away.
在四个大，卫四公转轨道离最远，约达200万千米。
The four largest moons, Io, Europa, Ganymede, and Callisto, are large enough to be seen from Earth with a telescope.
从地球上就可以用望远镜看到最大四颗卫，卫一，卫二，卫三，卫四。
Juice will investigate three of the so-called Galilean moons-Callisto, Europa and Ganymede, all of which are thought to have subsurface oceans.
“果汁”探测器将调查三颗所谓伽略卫——卫四、卫二和卫三，这三颗卫都被认为拥有地下海洋。
" Jupiter's biggest moon is Ganymede, not Callisto, " she said, pointing over Ron's shoulder at a line in his Astronomy essay, " and it's lo that's got the volcanoes."
“最大卫是卫三，不是卫四，”她从罗恩身后指着他那篇天文学论文一文字说道，“有火山应该是卫一。”
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详细解释
二、
、
被
有一层很薄的大气层。
卫
，土
斯托），直径约4800公里。
，
波特与凤凰社
