1.
The diameter of the inside of a round cylinder, such as a tube.
口径圆柱体内侧圆的直径，如管道
2.
Measure the diameter of this circle.
量一下这圆的直径。
3.
the ratio of the circumference to the diameter of a circle.
圆周长度与圆的直径长度的比。
4.
The diameter and the circumference of a circle correlate.
圆的直径与圆周互相关联。
5.
The axis of a circle is its diameter.
圆的轴线是其直径.
6.
Ring's diameter increases as we move away from the apex of the cone.
诸圆环的直径自圆锥顶逐渐增大。
7.
The Method and Instrument of Measuring Addendum Circle and Dedendum Circle Diameter
齿顶圆与齿根圆直径的测量及其量具
8.
diameter of root circular-arc center circle
齿根圆弧中心圆直径
9.
diameter of tip circular-arc center circle
齿尖圆弧中心圆直径
10.
diameter of top circular-arc juncture circle
齿顶圆弧衔接点圆直径
11.
diameter of tip circular-arc juncture circle
齿尖圆弧衔接点圆直径
12.
diameter of root circular-arc juncture circle
齿根圆弧衔接点圆直径
13.
the velocity of light is a constant.
圆的周长和直径的比是常数。
14.
Diameter Tolerance, Ovality and Average Decarburized Layer Depth
直径公差，偏圆度及脱碳层的平均深度
15.
Single cylinder knitting machines, up to 165mm diameter
直径165毫米以下的单针筒圆型针织机
16.
The ratio of circumference to diameter is approximately 3.1416.
圆周长与直径的比大约是3.1416。
17.
"because a straight line can be thought of as an arc of a circle of infinite radius, its curvature is zero."
直线可视为半径无穷大的圆,曲率为0
18.
Characteristics of Small Hole Grinding for Hard and Brittle Materials;
硬脆材料小直径内圆磨削特性的研究