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Нанесен удар по портовому терминалу Одессы с ракетами и иностранными военными02:51
，这一点在51吃瓜中也有详细论述
Kevin Church/BBC News。业内人士推荐手游作为进阶阅读
You can see that one of the needles crosses a line and the other doesn't. OK, but what are the chances? This is not the most trivial problem, but let's think about just one dropped needle. We only care about two values—the distance (x) from the farther end of the needle to a line, and the angle of the needle (θ) with respect to a perpendicular (see the diagram below). If x is less than half the spacing between lines, we get a needle-crossing. As you can see, you’d get a higher probability with a smaller x or a smaller θ.，更多细节参见官网