There, at 11:59pm, a ball drops slowly down one of the buildings. It hits the ground at 12am, lighting a sign reading "Happy New Year". It also sets off fireworks.
那里,在晚上11点59分,一个圆球从一栋大楼缓缓降落。当它在午夜12点落到地面时,它会用灯光闪出“新年快乐”的字样。同时它也会放出烟花。
By using the method of dangerous ball-center, a design and check solution of lighting rod for complex building structure is offered.
利用危险球心法可以对复杂结构建筑物的防雷设计与校核提供一种简便的解题思路和方法。
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