单词：portable electric tool
单词：portable electric tool 相关文章
[00:00.00]I never watch the TV all night. [00:03.08]I watch TV for sixteen or seventeen hours a day [00:07.05]I also do some exercise every day. [00:09.82]I take Tina,the dog.for a walk every afternoon. [00:13.61]I don't go far,of course. [00:15.74]I
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Electric Fish 发电鱼 One way that Harold Zakon and his team find fish to study is to put electrical detectors into the bottom of murky streams in Venezuela. This works because certain fish emit pulses of electricity. Discover electric fish -- on tod
(科普英语)Earth and Sky
American inventor John Goodenough first started working on battery technology more than 40 years ago. Goodenough actually co-invented lithium-ion batteries in 1980. This eventually led to a revolution in the electronics industry because those devices
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Texting Becomes a Health Tool in Kenya Mobile phone use in Africa has spread far, wide and fast. By the end of last year, it was estimated that 70 percent of the population would have a mobile phone. Now, the International Federation of the Red Cross
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