瓶頸的用法和樣例：
例句
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啤酒瓶底的沉淀物一到瓶頸部位，就不要往外倒啤酒了。此時(shí)你的一杯啤酒會(huì )金燦燦地發(fā)亮，酒泡鼓出酒杯口，而又不會(huì )溢出杯外。
As soon as the sediment starts creeping up the shoulder of the bottle, stop pouring. You should now have a glass of star-bright beer with a head(of foam) that stands proud of the glass but does not overflow.
