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。
For years he has been asking me to collect snails from my garden and take them to him.
多年来,他一直让我把我园子里的蜗牛收集起来给他捎去。