研究人员表示气球和化学物质的重量将相当于数辆双层汽车，运送它们需要非常大的卡车。
Researchers said the weight of the balloon and chemicals would match several double decker buses, requiring a very large vessel.
在当时，小汽车的牌照和大卡车的牌照一样，都是根据车辆的重量来收费的。
At the time, car tags, like truck licenses, were priced according to vehicle weight.
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