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。
But when table, penholder and paper are all moving, how is it possible to write legibly?
可是,当桌子、夹笔装置、纸都在移动时,怎么能书写得清楚呢?