Building on a Soviet-era foothold, Russia is expanding its monitoring stations for Glonass, its version of the Global Positioning System ( ' , GPS).
出自-2016年12月阅读原文
Building on a Soviet-era foothold, Russia is expanding its monitoring stations for Glonass, its version of the Global Positioning System GPS.
2016年12月六级真题(第三套)阅读 Section B