我们不敢相信武汉的火神山和雷神山医院不到15天就建成了．
We can't believe that Huoshenshan Hospital and Leishenshan Hospital in Wuhan ______ within just 15 days．
与过去的定位系统相比，北斗定位系统更精准更强大．
the positioning systems in the past， Beidou positioning system is more accurate and powerful．
当我看到这张相片的时候，就忍不住想起我的老朋友．
I of my old friends when I see this photo．
中国人口占全世界人口的五分之一．
The population of China is of the world's population．
鄂尔多斯是内蒙古西部一座美丽的城市．
Ordos is a beautiful city Inner Mongolia．