It is brewed from malt and hops.它用麦精和蛇麻草酿成.German beer has traditionally been made from just four ingredients — hops, malt, yeast and water.德国啤酒传统上只用4种原料——啤酒花、麦芽、酵母和水。Hops serve to embitter beer.酒花的作用是使啤酒发苦.They were afr...
交换力的条件与同位旋完全无关.The condition of an exchange force has nothing to do with isospin.同位旋是矢量.Isospin is a vector quantity.由激光发射出的光线都是同位的.All rays leaving the laster are in phase....