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。
Describe the arrangement of needles in punched non-woven production line. Introduce two up to date ways to arrange the needles by computer.
结合生产工艺，阐述针刺布生产线的针板配置，介绍两种全新的电脑布针方法。
Describe the arrangement of needles in punched non-woven production line. Introduce two up to date ways to arrange the needles by computer.
结合生产工艺，阐述针刺布生产线的针板配置，介绍两种全新的电脑布针方法。
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