霍尔式曲轴位置感测器

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Real-time information about whats happening in our bodies at the cellular level could be crucial for fighting cancer and other life-threatening conditi

发表于:2018-12-24 / 阅读(58) / 评论(0) 分类 Scientific American(十二)月

One of the most exquisite heat sensors in the worldits not in some government lab. It's in the head of a snake. The pit viper, to be specific. They're incredibly sensitive. They beat any of the synthetic counterparts, even the most expensive semicond

发表于:2018-12-24 / 阅读(50) / 评论(0) 分类 2017年Scientific American(二)月

我们上次讲了两个以fight为关键词的习惯用语:fight tooth and nail意思是全力拼搏;fight to the bitter end,解释坚持斗争到底。我们今天再讲两个。第一个是: you can't fight city hall。City hall意思是市政

发表于:2019-01-16 / 阅读(95) / 评论(0) 分类 美国习惯用语

If you drop the ball, gravity will pull it toward the center of the earth, but will not diminish that extra eastward speed. So as the ball falls itll outrun the ground and land slightly east of the straight-down point. Edwin H. Hall, a Harvard Univer

发表于:2019-02-15 / 阅读(17) / 评论(0) 分类 英语时差8,16

But measuring movement is actually pretty tricky. Any small mistake in the measured acceleration results in position errors that grow with time. So even if youre standing still and just rocking in place, a navigation computer relying solely on the IM

发表于:2019-03-06 / 阅读(90) / 评论(0) 分类 英语时差8,16

But measuring movement is actually pretty tricky. Any small mistake in the measured acceleration results in position errors that grow with time. So even if youre standing still and just rocking in place, a navigation computer relying solely on the IM

发表于:2019-03-12 / 阅读(167) / 评论(0) 分类 英语时差8,16
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