Many medicine makers decided to hold on to their supplies, planning to sell the medicine later at higher prices.

许多制药商决定保留他们的供应，计划以后以更高的价格出售药物。

A society as complex as this needed people who could supervise building works, organise payments, manage food supplies, plan troop movements, compute the flood levels of the Nile-and much, much more.

因此需要监督建筑工程、安排付款、管理食物供应、计划军队调动、计算尼罗河洪水水位等人才。