As the economists Jess Gaspar and Ed Glaeser have pointed out , they are complements to it.正如经济学家杰斯?加斯帕(JessGaspar) 和艾德?格莱泽(EdGlaeser)所指出的, 它们只是面对面交流的一种补充.That's Jess Fisher's sister, Eva Mae.那个是杰西.菲舍尔的妹妹, 伊娃.美...
保存得太久的食品会变坏,是因为受到酵母菌, 霉菌和细菌的侵袭.Food which is kept too long decays because it is attacked by yeasts, molds and bacteria.防止啤酒变坏的主要方法是用纯酵母菌株发酵.The principal methods of avoiding spoilage are the use of pure yeast strains as ...