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In ancient times, people who made beer lacked the means to preserve and filter it properly, so the drink was cloudy and turned bad quickly. It was medieval European monks who introduced scientific brewing techniques in an effort to produce a nutritious beverage to supplement their meager diets.
古时的啤酒酿造者缺少良好的保存方法及过滤工具，所以啤酒混浊而且容易变质，正是中世纪欧洲的僧侣们引进科学的啤酒酿造技术，制造有营养的饮料， 从而补充了他们贫乏的饮食。
