yán / jiū / nóng / yùn / de / lì / shǐ / kě / yǐ / bāng / zhù / wǒ / men / lǐ / jiě / shè / huì / biàn / gé / de / yuán / yīn研究农运的历史可以帮助我们理解社会变革的原因。Studying the history of peasant movements can help us understand the causes of social change.