增中子

数学英语 33 Is Multiplication Repeated Addition?

by Jason Marshall In past articles weve talked at length about three of the big four traditional processes used in basic arithmetic: addition (see also How to Add Quickly), subtraction, and division. However, for one reason or another, we havent yet

发表于:2018-12-07 / 阅读(45) / 评论(0)

数学英语

太阳科普第9期

Plasmas I always like to think of as being like naughty children. 我一直觉得电浆就像调皮的小孩 They're full of energy and they are, 充满了能量，随时随地都想捣蛋 want to misbehave and it's ourjob to try 我们的工作就是

发表于:2018-12-07 / 阅读(77) / 评论(0)

太阳科普

SSS 2010-02-04

Some people of Italian ancestry, like me, might have a surprise in the family treea man of east Asian descent, who was living and working 2,000 years ago in the boondocks near the heel of the Italian boot. The discovery is the first good evidence of

发表于:2019-01-08 / 阅读(46) / 评论(0)

Scientific American(二)月

纯正英语一分钟-multiplication

When I was a kid I was top of the class in maths. I was really good at mental arithmetic and doing sums. Things were easy back then, It was all addition and subtraction, multiplication and division. I knew my times tables like the back of my hand. Th

发表于:2019-01-21 / 阅读(52) / 评论(0)

纯正英语一分钟

托福考试：TOEFL模拟试题

Questions 12-20 The elements other than hydrogen and helium exist In such small quantities that it is accurate to say that the universe somewhat more than 25 percent helium by weight and somewhat less than 25 percent hydrogen. Astronomers have measur

发表于:2019-02-05 / 阅读(53) / 评论(0)

托福英语

万物简史第277期:砰!(12)

This involved bombarding samples with neutrons in a small nuclear reactor and carefully counting the gamma rays that were emitted; 这项技术包括在一个小型核反应堆里用中子轰击样品，仔细计算释放出来的射线。 it was ext

发表于:2019-02-25 / 阅读(72) / 评论(0)

万物简史

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