200 million Chinese leave the cities, the biggest annual migration of people on the planet.
每年中国有2亿人离开城市 已成为这个星球上最大的人类迁徙
But how do so many leave their new cities for the homes of their parents and grandparents?
但是这么多人怎样从他们新的城市回到他们父母和祖父母的家呢
By adopting the most advanced transportation system in the world - high speed rail.
依靠世界上最先进的交通运输系统 高铁
Started only in 2007 at 6,000 miles and growing, it's already the longest bullet train network in the world.
2007年开始 既有6000英里铁路提速 并不断修建新的线路 如今它已是世界上最长铁路运输网络
Traveling the 800-mile trip from Shanghai to Beijing used to take 14 hours.
从上海去北京800英里的路程以前要用14小时
Now you can get there in just over 5 hours.
现在只需要5个多小时