易拉罐 最初的铝罐虽然罐顶要比钢罐容易打开,但还是需要分离式的开罐器,这是一项明显的缺点,尤其在家庭野餐时经常会有很多啤酒没有钥匙型开罐器。1959年,俄亥俄州的艾玛·弗兰兹用汽车保险杠杆打开啤酒,正是在这种场合,这种方法产生的泡沫显然比饮料多,据说当时弗兰兹说了这么一句话:“一定有更好的方法！”次夜,他由于饮用太多的咖啡无法入睡,所以到地下室工作间思考如何将开罐头的杠杆粘 Cans The First Aluminum Cans Although the can tops are easier to open than steel cans, the need for separate can openers is an obvious drawback, especially when family picnics often involve many beers without a key can opener. In 1959, Emma Franz of Ohio opened the car with a bumper on a car, and it was on this occasion that this method was apparently more frothy than a drink. Franz was said to have said something like this: “Certainly There is a better way! ”The next night, he could not sleep because he was drinking too much coffee, so he went to the basement to think how to open the can