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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. If you have a dog, you know you gotta walk it. But do you know how it walks? Well, if you have no idea which foot Fido puts forward when, youre in good c
发表于:2019-01-08 / 阅读(60) / 评论(0)
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AS IT IS 2014-09-03 Virginia Site Tests Drones for FAA Rules 维吉尼亚测试无人机以帮助航空管理局制定发展规则 The Federal Aviation Administration, or FAA, has chosen a university town in Virginia as one of six places to test dron
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