Have you ever wondered why when you go to the gas station to fill up the family car, the price of gas at the pump has just jumped 25 cents a gallon over the past three days?
当你在加油站为了的爱车加油的时候，你是否意识到从油泵出来的汽油在短短3天内就上涨了25美分？
Under normal circumstances such as the design of the gate, just to meet the opening and closing when the pump station working and the need for maintenance requirements;
对于闸门的设计，需要考虑的时间跨度比较大，考虑的情况也比较多。 比如正常情况下闸门的设计，只需满足开、关泵站以及需要检修时的要求；
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