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
Yes, and we must stop people walking on this floor until it's firm. It may be necessary to put up a notice saying Keep off. Another thing, we' ll have to drill a hole in the wall for the electric wires.
是的，因此在地板牢固前，我们必须防止人们从地板上行走。可能还需要竖一个布告牌，写上“不得践踏”。还有，我们必须在墙上钻一个电线孔。
Maori families enjoy sharing what they own and looking after one another.
毛利人家庭喜欢共同分享他们之所有，并乐于相互关照。
They discovered that the farther away the feeding station was, the slower the dance was.
他们发现离喂食点越远，蜜蜂就跳得越慢。