It is a labor to task the faculties of a man — such problems of profit and loss, of interest, of tare and tret,(8) and gauging of all kinds in it, as demand a universal knowledge.
这真是辛苦的劳役,考验着
的全部官能,——这些赢利
损失的问
,利息的问
,
皮重的计算问
,
切都要确实数字,非得有全宇宙的知识不可啊。