Drop the needles on the paper and calculate the percentage that fall on a line. With enough attempts, the answer should be the needle length divided by the width between lines, all multiplied by 2/pi.
将针随便丢在纸上，然后计算出落在线上的针的百分比，随着尝试次数的足够多，最终这个百分比将越来越逼近针的长度除以格子的宽度再乘以2/pi。
They also make sure that any embedded drop-down lists take on the same width.
它们也确保任何嵌入的下拉列表的宽度相同。
The pressure drop increases as the Reynolds number, the fin width and the fin height increase.
压力下降的情况会随着雷诺数升高而升高，也会随着散热片的高度和宽度提高而提高。
Falls drop more than 30 meters, a width of more than 10 meters, "Sea Eye" spring roll, among layers of white spray, Zhener sound.
瀑布落差30余米，宽约10多米，“海眼”泉水翻滚，激起层层白色浪花，响声震耳。
The user doesn't have to remember or type words like Page Width or Whole Page because they are there to be chosen from the drop-down list.
用户无须记住或输入如页面宽度和整个页面这样的单词，因为它们可以在下拉列表中选择。
Fracture width has a steeper drop than the straight fracture's at the crosspoint, the existence of cutoff-point will lead early-stage screen out.
缝宽在相交点处比直线裂缝有一个较陡的下降，截流点的存在将导致早期的端部脱砂。
The measurable spreader may evenly drop beads, the width of bead dropping can be adjusted optionally.
定量式散布器落珠均匀，散珠宽度任意调整。
It is shown that, as the gate length decreases, the gap width between the gates increases and the depth of the channel becomes shorter, the transmitted charge handling capacity will drop from 6.
结果表明，随着栅长减小、栅间隙长度增加和沟道深度减小，传输栅电荷容量约从6。
The characteristics of two-phase flow pressure drop were experimentally investigated in narrow rectangular channels with large width-height ratio 1.
矩形窄缝通道内水的两相沸腾流动特性进行了实验研究。
Place your feet shoulder width apart, gently drop hands towards ground in front, hold 10-15seconds.
两脚分开，与肩同宽，向地面弯腰，手向下放，保持10-15秒。
Place your feet shoulder width apart, gently drop hands towards ground in front, hold 10-15seconds.
两脚分开，与肩同宽，向地面弯腰，手向下放，保持10-15秒。
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