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。
Before he retired, Frank was the head of a very large business company, but as a boy he used to work in a small shop.
在退休前,弗兰克是一家非常大的商业公司的经理,但他小时候却在一家小铺里做工。