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
You certainly did!
你吼得好凶呀！
One man was told to fix up an air-line to provide compressed air for the machines they were using.
有个工人被派去安装"供气管"，给他们正在使用的机器提供压缩空气。
We succeeded in lighting the fire.
我们成功地点着火。