我上工具书
Farmer: a person who cultivates land or crops or raises animals (as
livestock or fish)
Peasant：
1: a member of a European class of persons tilling the soil as small
landowners or as laborers; also : a member of a similar class elsewhere
2: a usually uneducated person of low social status
你教授说的农奴的标准的词汇应该是serf
Serf：a member of a servile feudal class bound to the land and subject to
the will of its owner
