20201209word phrase sentence，
Saturn土星，
--- 16亿公里a billion miles trip to Santurn from the Earth.
---ice ring 比土星年轻45亿年，four and a half billion years，
---With sunlightalmost 100 times weaker on Saturn than it is here on Earth.土星上的光照强度只有地球上的百分之一，
---Lightning10,000 times more powerful than on earth Illuminates the sky.闪电威力比地球上强一万倍照亮天空。
chaotic gas，混乱不堪的大气层
土卫1—
- lo is a vision of hell！人间炼狱
-Its surface was tormented by waves of molten rock.四处流窜的岩浆侵袭着它的表面，
Alps阿尔卑斯