From Horse Pulled Wagons…to Bullet Trains
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视频说明
Modern transportation technology lets us travel hundreds of miles to go to work, and eat food grown half-way around the world. It's made life much easier for us than it was for our ancestors. But it's caused big problems, too, and given us important choices to make for the future.
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热门免费线上视频标签儿童
插件
26 八月 2018
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