一种神秘的生物占据了地球，人类不得不在天空方舟，一个空中的人造城市中避难。
Now inhabited by by a mysterious race of creatures, humanity has been forced to find refuge in the SkyArk, a man-made city in the sky.
这座城市满是天然和人造的小湖泊。
The city is dotted with small lakes, natural and artificial.
到2020年，中国准备在哪个城市上空放置一个人造月亮？
Above which city is China preparing to put a man-made moon in the sky by 2020?
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