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遮阳伞：看庙的时候对遮阳需求不大，但最晒的往往都是从马路边走到庙里的时候，这种时候防晒伞就特别有用了！
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一次常规的升级，一个适合更多人的选择：新款 iPad Air 首发体验
Decades earlier, Buffon had posed this as a probability question in geometry: Imagine you have a floor with parallel lines separated by a distance d. Onto this floor, you drop a bunch of needles with length L. What is the probability that a needle will cross one of the parallel lines?