·2,447,543篇论文数据，部分数据来源于NoteExpress
轮作的四种作物是玉米、大豆、小麦和苜蓿，四年内每年种植一种作物。
The four crops grown in rotation are corn, soybean, wheat, and alfalfa, with one crop grown each year during the 4-year cycle.
youdao
应用推荐
模块上移
模块下移
不移动