时间:2019-01-10 作者:英语课 分类:与美国小学生一起学英文第9册


英语课

   Diameter 1 直径


  A diameter is a straight line inside a circle. 直径是圆内的直线。
  Can any straight line in a circle be a diameter? 圆内的任何直线都是直径吗?
  No, its two ends must meet at two different points on the circle. 不是,直线的两端必须连在圆内的不同点上。
  And the half point of the diameter should be the center of the circle. 而且直径的中心是圆心
  Why do we need to know about diameters 2? 为什么我们需要了解直径?
  Because they are very useful when you draw a circle. 因为你画圆的时候,直径就非常有用。
  Draw a circle that has a diameter of five centermeters. 画一个直径为五厘米的圆。
  And ask your friend to draw a circle that has the same diameter. 并请你的朋友也画一个直径相同的圆。
  Then compare the two circles. 然后对比一下这两个圆。
  Don't they look exactly the same? 它俩是不是一模一样啊?

n.直径
  • The circle has a diameter of 6 inches.这个圆直径六英寸。
  • A diameter passes through the center of a circle.直径从圆心穿过。
n.直径( diameter的名词复数 );放大率
  • Any two diameters of a circle intersect each other. 圆周内两直径必相交。 来自《现代汉英综合大词典》
  • This microscope magnifies 40 diameters. 这台显微镜能放大40倍。 来自《简明英汉词典》
标签: 小学英语
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08059
agminated
Amamee
anxiety reactions
arc magmatism
arthropleuron
atomistic fallacy
back-to-the-school movement
bankukri cotton
base-line terminal station
basic indicator
Bendopa
bloemspruit
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brothered
Bulbophyllum affine
C.E.T.
call it a draw
carmakers
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cross guarantee
cultural resource geography
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Defense Contract Management Agency
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from all quarter
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hexatomic molecule
Hickman County
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hummer electric screen
index number of value construction output
indirect distance surveying
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jet exhaustion
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Limnodromus
long-sleevest
magnet telephone
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manducate
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mid-span spectral inversion
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noise measurement
non-inheritedness
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not take kindly to sth
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oil resistant primer
old beau
open one's mind to
order-issuing procedure
oscillating fringe pattern
parametric infrared image converter
paratenovite
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scare up something
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service payments as percentage of exports of goods and services
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smaller multangular bone
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soil evolution
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square hewn
standard metropolitan area
steady state characteristic
streptococcal sore throat
to bite the hand that feeds
travel-time ratio
trident C-4
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two-dimensional motion
uns
utly
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Y connection