Radius
[ 'redɪəs ]
第5级
其它 Other
n. 半径（距离）;用半径度量的圆形面积;半径范围;桡骨;
💡 词根助记
radi光线 + us 用→ 用光线扫出一个圆，则光线是→半径
📝 例句
The given radius being 4 ft., find the circumference.
已知半径为四英尺,求周长。
Let us draw the circle with center at O and radius equal to a.
我们以点O为圆心，以a为半径，作圆。
within the radius of one's experience
在个人经验范围之内
Step edges that are parallel to the planet radius are coated symmetrically.
与行星径向平行的台阶边缘被对称淀积。
One solar radius equals 696,000 kilometers.
一个太阳半径等于696，000公里。
🌱 联想助记
【记】※ radio-收音机,radius-范围:收音机的传播范围很广
※ radi-radio收音机,us-我们:我们在测量收音机的半径
※ radi-radio收音机,us-我们:我们在半径方圆内都听得到收音机
🔤 词根
-radi-表示“光线”
📖 牛津释义
radius
n
(pl -dii )
1 (length of a) straight line from the centre of a circle or sphere to any point on its circumference or surface 半径（距离）. =>App 5 见附录 5. =>illus at circle 见circle插图.
2 circular area measured by its radius 用半径度量的圆形面积; 半径范围
Police searched all the woods within a six-mile radius/within a radius of six miles. 警方搜索了在周围六英里以内的树林各处.
3 (anatomy 解) outer shorter bone in the human forearm; corresponding bone in an animal's foreleg or a bird's wing （人与兽的）桡骨; 鸟翼中相当於桡骨的骨. =>illus at skeleton 见skeleton插图. Cf 参看 ulna.
🎯 考研助记
收音机(radio)的 半径有美国(us)那么大
🔁 扩展释义
*['reidiәs]n. 半径, 范围, 辐射光线【电】 半径
🏥 医学释义
①桡骨 ②半径
🌿 同词根单词
📖 同为「CET-4」词汇
查看全部CET-4词汇 ›🗣️ 情景例句
I'm afraid I can't agree with you. That's a good way of giving information, but it's not a good way of persuading people. For one thing, it's boring, and people aren't going to read an ad that looks boring. For another thing, one computer looks very like
恐怕我不能同意你的意见。那是个通报信息的好办法，但并非是使人信服的好办法。一是它很乏味，人们是不会去读一则看起来很乏味的广告的。其次，计算机彼此都很相像。人们不会记住产品的名字的。
Haley jumped up and cried, That was my ancestor.
哈利跳起来叫道，“那就是我的祖先。”
We were so excited, my brother and I, that we did not get to sleep until very late.
我们太激动，以至于我和我弟到很晚才睡得着。