这样，有90％以上的光落在第二暗环所包围的圆面积之内。
Thus more than 90 per cent of the light is contained within the circle bounded by the second dark ring.
统计典型区域中毛细管个数，参照圆面积公式得到纱线中毛细管当量半径。
According to the area of capillaries, the number of capillary and the formula of circle, the equivalent radius of the five kinds of the yarns was gotten.
如果数据集较大，或者经常发出请求圆面积的查询，那么创建函数索引将有助于提高性能。
This is beneficial when the dataset is large and the frequency of queries that request the area of a circle is high.
当轴向应力与剪应力幅值的比值保持不变时，砂土液化强度随着椭圆面积的增大而降低。
For the same ratio of two stress components, the resistance to liquefaction of saturated sand decreased with the increasing area of the elliptical stress path.
那么，改变一下区域，把这块移到另一侧，我们得到对xdA的双重积分,是原点那的圆面积乘质心的x的坐标。
So, switching the area, moving the area to the other side, I'll get double integral of xdA is the area of origin times the x coordinate of the center of mass.
由于分类的依据是气泡表面积的大小，确定了圆面积和圆形度两个最能表征类圆形表面积的分量组成分类特征向量。
Area and circularity act as two elements of the eigenvector for they can remarkably characterize the surface area of the bubbles.
摘要把紧密相连的圆环构成的圆盘以渐开线展开成等面积的直角三角形，得出了较为直观的由周长和半径表示的圆面积公式。
The disk, which is composed of continuous annuluses, can expand equivalent trangle by asymptotice line. We can obtain the circular area which is visually expressed by circumference and radius.
摘要把紧密相连的圆环构成的圆盘以渐开线展开成等面积的直角三角形，得出了较为直观的由周长和半径表示的圆面积公式。
The disk, which is composed of continuous annuluses, can expand equivalent trangle by asymptotice line. We can obtain the circular area which is visually expressed by circumference and radius.
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