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。
These days, it is differences in national regulations, far more than tariffs, that put sand in the wheels of trade between rich countries.
当前,是各国管理条例上的差异,而不是关税阻碍了发达国家之间的贸易。