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Tree Electricity Runs Nano-Gadget A report in the journal IEEE Transactions on Nanotechnology shows that maple trees generate a small, but measureable amounts of electricity, which can power tiny devices. Karen Hopkin reports If scientists have thei
60秒科学
If scientists have their way, we may someday be tapping maplesnot for pancake fixins, but for power. Because researchers from the University of Washington in Seattle have found theres enough electricity flowing in trees to run an electronic circuit.
Scientific American(九)月
As the International Year of the Potato 2008 winds down, the United Nations is appealing for continued global attention on the role the potato can play in providing food security and eradicating poverty in helping to achieve the Millennium Developme
VOA标准英语2008年(十一月)
as American as apple pie hot potato 美国人很喜欢吃 apple pie。 Apple pie是一种用烤箱制作的甜点心，它的外面是一层面粉，里面是用苹果做的馅儿。中文有时把 ap
美国习惯用语
couch potato mall rats 电视业的发展，特别是有线电视的出现为美国人提供了更多的选择，随之也就出现了一种花很多时间看电视的电视迷，人们把他们叫做：
美国习惯用语