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神经心理学家Kim Gorgens论述了如何更好地保护我们的大脑,免受脑震荡的风险,并且倡导让孩子戴上头盔。
Hello to you, I'm Creshon Saunders at the CNN.com newsroom in Atlanta; here is a look at what's happening NOW IN THE NEWS. Severe storms ripped across Spain Saturday leaving down trees, darkness and destruction behind. The winds are also responsible
[00:00.00]Module 4 CHANGES [00:06.26]Unit 2 Kunling was a beautiful place. [00:11.43]1 Listen and read [00:14.94]Help our town! [00:17.53]Our town,Kunling was a beautiful place. [00:21.55]The river was clean [00:23.59]and there were many old trees be
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Landfills produce methanewhich can be valuable as an energy source. But scientists haven't known why landfills make so much methane. The solid waste in