Radius
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第5級
其它 Other
n. 半徑（距離）;用半徑度量的圓形面積;半徑范圍;橈骨;
?? 詞根助記
radi光線 + us 用→ 用光線掃出一個圓，則光線是→半徑
?? 例句
The given radius being 4 ft., find the circumference.
已知半徑為四英尺,求周長。
Let us draw the circle with center at O and radius equal to a.
我們以點O為圓心，以a為半徑，作圓。
within the radius of one's experience
在個人經驗范圍之內
Step edges that are parallel to the planet radius are coated symmetrically.
與行星徑向平行的臺階邊緣被對稱淀積。
One solar radius equals 696,000 kilometers.
一個太陽半徑等于696，000公里。
?? 聯想助記
【記】※ radio-收音機,radius-范圍:收音機的傳播范圍很廣
※ radi-radio收音機,us-我們:我們在測量收音機的半徑
※ radi-radio收音機,us-我們:我們在半徑方圓內都聽得到收音機
?? 詞根
-radi-表示“光線”
?? 牛津釋義
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 半徑（距離）. =>App 5 見附錄 5. =>illus at circle 見circle插圖.
2 circular area measured by its radius 用半徑度量的圓形面積; 半徑范圍
Police searched all the woods within a six-mile radius/within a radius of six miles. 警方搜索了在周圍六英里以內的樹林各處.
3 (anatomy 解) outer shorter bone in the human forearm; corresponding bone in an animal's foreleg or a bird's wing （人與獸的）橈骨; 鳥翼中相當於橈骨的骨. =>illus at skeleton 見skeleton插圖. Cf 參看 ulna.
?? 考研助記
收音機(radio)的 半徑有美國(us)那么大
?? 擴展釋義
*['reidi?s]n. 半徑, 范圍, 輻射光線【電】 半徑
?? 醫學釋義
①橈骨 ②半徑
?? 同詞根單詞
?? 同為「CET-4」詞匯
查看全部CET-4詞匯 ›??? 情景例句
Mercy brings good. Mercy falls like the gentle rain from the sky upon the earth.
慈悲帶來益處。慈悲像甘露從天空中降到地面上。
It is better to ask for help at the beginning rather than to wait until a busy period when everyone is rushed off their feet.
最好在開始工作時就請人幫忙，而不是等到大學都忙得不可開交的時候。
It was a Sunday in May. My brother and I had decided to go off for a long walk while we were staying with my grandparents in the French countryside.
5月的一個星期天，我和弟弟決定去遠足。當時我們住在法國鄉下的祖父母家中。