Fifty-litre carboy would be the most economical size. Carboys may be retained without charge for two months.
50升的瓶子应是最经济的尺码,这些瓶子可免费保存两个月。
Frank smiled when he remembered his hard early years and the long road to success.
弗兰克回想着他早年的艰难经历和走过的漫长的成功之路,微笑了。