单词:dynamic stability condition
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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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