radian

/ˈreɪdiən/

Meanings

noun

弧度

In the International System of Units, the derived unit of plane angular measure of angle equal to the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle. Symbol: rad

Examples :

"The angle formed when you wrap the radius of a circle around its edge is one radian, a common unit for measuring angles in math and physics. "

当你把一个圆的半径长度弯曲后放到圆周上，所形成的夹角就是一个弧度，这是一种在数学和物理学中常用的角度单位。

Related Words

measure noun

/ˈmɛʒə/ /ˈmɛʒɚ/

衡量，措施

"The recipe calls for a precise measure of baking soda. "

这个食谱要求精确分量的烘焙苏打。

subtended verb

/sʌbˈtɛndɪd/ /səbˈtɛndɪd/

正对，对向，对

"The angle formed by looking at the top and bottom of the flagpole from where I stood subtended the entire height of the flagpole. "

从我站立的地方看旗杆的顶部和底部所形成的夹角，正好对着旗杆的整个高度。

centre noun

/ˈsen.tə(ɹ)/ /ˈsɛn.tɚ/

圆心，中心。

"The teacher marked the centre of the circle on the chalkboard before starting the geometry lesson. "

老师在开始几何课之前，在黑板上标出了圆心。

circumference noun

/sɜːˈkʌm.fɹəns/ /sɝːˈkʌm.fɹəns/

周长，圆周。

"The circumference of the circular table was too large to fit in the dining room. "

这个圆形餐桌的周长太大了，餐厅放不下。

angular noun

/-lɑɹ/

隅骨

"The paleontologist carefully brushed away the dirt, revealing the small, fragile angular of the fossilized fish jaw. "

古生物学家小心翼翼地刷去泥土，露出了这块化石鱼下颌中细小而脆弱的隅骨。

derived verb

/dɪˈɹaɪvd/

获得，取得，源于。

"The student derived the answer to the math problem from the formula. "

这个学生从公式推导出了这道数学题的答案。

physics noun

/ˈfɪz.ɪks/

泻药，泻剂

"The doctor prescribed a physics to help her patient with indigestion. "

医生开了一种泻药来帮助她的病人消化不良。

circle noun

/ˈsɜɹkəl/ [ˈsɜː.kəɫ] [ˈsɝ.kəɫ]

圆圈，圆形。

"The set of all points (x, y) such that (x − 1)2 + y2 = r2 is a circle of radius r around the point (1, 0)."

所有点 (x, y) 满足 (x − 1)² + y² = r² 的集合构成一个以点 (1, 0) 为圆心，半径为 r 的圆圈。

system noun

/ˈsɪstəm/

系统，体系。

"There are eight planets in the solar system."

太阳系里有八颗行星。

measuring verb

/ˈmɛʒ.ə.ɹɪŋ/ /ˈmɛʒ.ɚ.ɪŋ/

测量，衡量

"We measured the temperature with a thermometer. You should measure the angle with a spirit level."

我们用温度计测量了温度。你应该用水平仪测量角度。

length noun

/lɛn(t)θ/

长度，长短。

"The length of the classroom is 20 meters. "

教室的长度是二十米。

international noun

/ˌɪntəˈnæʃ(ə)n(ə)l/ /ˌɪntɚˈnæʃ(ə)n(ə)l/

国手，国际选手。

"The United team includes five England internationals."

联合队包括五名英格兰国手。