妈妈70gallon重

从图书馆给小家伙借了本书--the mighty street sweeper，上面有一页说:the tanker truck holds 4000gallons of water. the street sweeper has a tank that holds 180 gallons of water.

有一天妈妈称体重，小家伙象模象样的走过来，蹲下看看体重称的指针，认真的说:妈妈，你有70 gallon 重。