单词：fluid-pressure scales
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Conditions on Mars were so harsh that it was hard to imagine any life surviving there. The idea of sophisticated aliens was wiped out. We know that conditions on Mars today are not very good for life.
火星生命
At this time of year when, everywhere we look, Americans are tempted by fattening holiday treats, many of us are resolving to lose weight in the New Year. So stepping on a scale is no fun unless you're the Columbus, Ohio, artist who has hopped onto t
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This is Scientific Americans -60 seconds science .I'm Steve Murskey.Got the minute? People with high blood pressure are often told to watch the salt, and it's long been far that hypertension related to excess salt is caused by the salt increasing in
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金属切削 metal cutting 机床 machine tool 金属工艺学 technology of metals 刀具 cutter 电路 circuit 半导体元件 semiconductor element 反馈 feedback 发生器 generator 直流电源
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SCIENCE REPORT-January 10, 2002: New Glaucoma Treatments By Nancy Steinbach This is the VOA Special English Science Report. Sixty-seven-million people around the world cannot see because they suffer f
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