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。
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