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.
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.
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