for draft beer the pre-condition is the proper temperature,pressure ...
问题描述：
for draft beer the pre-condition is the proper temperature,pressure ...
for draft beer the pre-condition is the proper temperature,pressure and control if co2 in the barrel or
应该是control of
答
对于扎啤(或生啤),适当的温度和压力,加上酒桶内二氧化碳的控制是先决条件.
barrel和keg 都是酒桶；Barrel 大些,Keg小一些.