By 2020, one fifth of the country's 150, 000 km railway network will be used by high-speed trains.
到2020年，中国15万公里铁路网的五分之一将供高速列车使用。
In the next three years, China plans to build 30 airports and 3, 000 km of railways.
未来三年，中国计划修建30个机场和3000公里铁路。
The Moon is in orbit around the Earth at an approximate distance of 377, 000 km (234, 000 miles).
月亮所运行的轨道距离地球约为377,000公里（234,,000英里）。
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