单词:recovery of chemical energy
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Unit 31 Cut down on sugar. Unit 31 少吃点糖 Does chocolate make you blissful? Youre not crazy,youre simply responding to a natural pleasure chemical produced when you eat sweets. This chemical speeds to your brain, making you happy and leaving yo
This is Scientific Americans 60-Second Science. I am Cynthia Graber. This will just take a minute. Solar panels typically convert sunlight into electricity or heat. But photosynthetic vegetation converts sunlight into chemical energy. Now M.I.T.s Dan
Battery 电池 A battery is a box of electricity. 电池是一盒电。 It stores chemical energy and this chemical energy changes into electricity. 它能储存可以转化为电能的化学能。 Can you name the things that need batteries? 你能列
暂无音频 Remarks By The President At Signing Of The American Ecovery And Reinvestment Act Denver Museum of Nature and Science Denver, Colorado The President: Thank you, everybody. Please have a seat. You guys can sit down, too. (Laughter.) Let me be
Weekly Address: President Obama Touts Nearly $2 Billion in New Investments to Help Build a Clean Energy Economy 每周电视讲话:奥巴马总统提出近20亿美元的投资计划助建清洁能源经济 WASHINGTON In this weeks address, Presiden
U.S. President Barack Obama is mandating higher energy efficiency standards for common household appliances as part of a broader effort to overhaul the nation's use of fuel and electricity. Mr. Obama says the economic recovery package before Congres