英语语法分析

Concentration of the samurai in castle-towns had acted as a stimulus to trade.

武士在城堡城镇的集中刺激了贸易的发展。

Once in debt, neither the individual samurai nor the shogun himself found it easy to recover.

一旦负债，无论是武士本人还是幕府将军本人都很难恢复元气。

It was difficult for individual samurai overlords to increase their income because the amount of rice that farmers could be made to pay in taxes was not unlimited.

对于单个的武士统治者来说，要增加他们的收入是很困难的，因为农民可以用来纳税的大米数量并不是无限的。