单词：portable electric dental engine
单词：portable electric dental engine 相关文章
Every morning, I brush my teeth right after I eat breakfast. I put a little toothpaste on my toothbrush and then brush for about two or three minutes. I brush up and down to reach the spaces between my teeth. I also use dental floss to remove food pa
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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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SCOTT SIMON, HOST: The Democrats' proposed Green New Deal calls for America to eliminate greenhouse gas emissions from U.S. transportation, an ambitious goal that would require - among many other things - phasing out cars that run on gasoline. That m
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