To mark or place(holes, for example) a fourth of a circle apart.
标示区域的四分之一将（如孔）标在或定在相距圆周的四分之一处
A unit of measure of longitude or right ascension, equal to15=or!/ 24of a great circle.
经度15°经度或赤经单位，相当于15°或圆周的二十四分之一
quarter elliptic spring
四分之一椭圆形弹簧
one-fourth concave arc milling cutter
四分之一凹圆弧铣刀
one-fourth convex arc milling cutter
四分之一凸圆弧铣刀
One quadrant of a circle contains all possible values of Zxy.
圆的四分之一包括了所在可能的Zxy值。
A rounded convex molding, often a quarter section of a circle or an ellipse.
凸圆线脚装饰一个圆的凸圆体塑模，通常为一圆或椭圆的四分之一部分
in quadrature with
与...相差四分之一周期
To saw(a log)into quarters lengthwise along its axis.
四分周锯开将（一圆木）沿中轴线纵向锯成四部分
One fourth of the period of the moon's revolution around Earth.
阴历月的四分之一月亮围绕地球公转一周的四分之一
"From the first to the fourth week, the liquidated damage shall be ____ percent of the value of the delayed Contract Equipment per week."
第一至第四周,每周的违约金为迟延交付设备价值的百分之________。
The boundary line of a circle.
圆周一个圆的边界线
Circumference:The boundary line of a circle.
圆周:一个圆的边界线.
As our circle of knowledge expands, so does the circumference of darkness surrounding it.
当知识的圆周扩大之时，包裹它的黑暗的圆周也一样。
three quarter elliptic spring
四分之三椭圆形弹簧
The plane area bounded by such an arc and two perpendicular radii.
四分之一圆，扇形体由九十度弧与两条垂直的半径围成的平面图形
A machine part or other mechanical device that is shaped like a quarter circle.
扇形体形状似四分之一圆圈的机器零件或其他机械设备
any shape resembling the curved shape of the moon in its first or last quarters.
类似于月亮围绕地球公转一周的前四分之一和后四分之一时弯曲的形状。