kvass

基本解释

The thirsty Soviet may have had his choice of beverages -- soda water from a machine, kvass from a barrel -- but rarely, if ever, did these things come with a paper cup, let alone a plastic one.
苏联人或许对于饮料可以有他们自己的选择，比如苏打水和克瓦斯啤酒。但是他们几乎用不上纸杯，更别说塑料杯子了。
Legend has him eating peasant food--cabbage soup, cabbage soup, porridge, meat with pickled cucumbers, ham and cheese, and kvass, which is a drink that I've actually tasted from fermented black bread.
据传他爱吃农家食物,诸如卷心菜汤,稀粥,腌黄瓜拌肉,芝士火腿和克瓦斯,这种酒由发酵的黑面包做成,我曾经尝过
It eventually spread to Russia and Eastern Europe, where it is known as kvass.
它后来传播到俄罗斯和东欧，在那里叫格瓦斯（kvass）。

Legend has him eating peasant food--cabbage soup, cabbage soup, porridge, meat with pickled cucumbers, ham and cheese, and kvass, which is a drink that I've actually tasted from fermented black bread.
据传他爱吃农家食物,诸如卷心菜汤,稀粥,腌黄瓜拌肉,芝士火腿和克瓦斯,这种酒由发酵的黑面包做成,我曾经尝过
耶鲁公开课 - 欧洲文明课程节选

an alcoholic drink of low strength made in Russia and E Europe from cereals and stale bread