1.
Students: The length of the curve making a circle is called the perimeter.
生：围成圆的曲线的长度叫做圆的周长。
2.
the velocity of light is a constant.
圆的周长和直径的比是常数。
3.
The circumference of the circle is 2πr and the time for one revolution is 2πr/v.
圆的周长是2πr，转一圈的时间是2πr／v。
4.
Teacher: Express the way of calculating the perimeter of a circle by letters.
师：圆的周长的计算方法，用字母公式表示。
5.
the ratio of the circumference to the diameter of a circle.
圆周长度与圆的直径长度的比。
6.
The circumference of the earth is almost 25000 miles/The earth is almost 25000 miles in circumference.
地球的圆周长约为25000.
7.
" Measurement of circumference and its variation for basketball, football, volleyball and handball"
GB/T14625.5-1995篮球、足球、排球、手球圆周长、圆周差的测量
8.
The ratio of circumference to diameter is approximately 3.1416.
圆周长与直径的比大约是3.1416。
9.
The boundary line of a circle.
圆周一个圆的边界线
10.
Circumference:The boundary line of a circle.
圆周:一个圆的边界线.
11.
The circle has greater area than a regular poiygon of the same perimeter.
圆的面积比同样周长的正多边形的面积大。
12.
Tell us which problems with the perimeter of a circle you can solve in your daily life.
举例说明你能解决生活中哪些圆周长的问题。
13.
Prolong Failure Cycle of API Round Thread Tubing by System Control
系统控制延长API圆螺纹油管的失效周期
14.
Cut-off: The maximum length of sheet that can be printed on a web press and equivalent dto the cirvumference of its impression cylinder.
截度:卷筒纸印刷机所印最长纸度，亦步亦趋是压力圆筒的周长。
15.
The disc of tooth is then temporarily grafted on to the inside of the cheek, where new tisssue grows round it. This skin also helps to combat rejection.
然后暂时将牙齿圆盘移植到脸颊内侧，在圆盘周围就会长出新的组织，这层新皮有助于抵制排斥。
16.
of or relating to an epicycle.
属于或关于周转圆的。
17.
allowable offset in circumferential joints
圆周焊缝的允许偏移
18.
arm circumference tape
测量胳臂圆周的卷尺