per unit area短语⁹⁰⁸⁸⁷⁺⁷ 基本例句 每一单位面积 We will effectively keep the area planted with grain crops stable, focus on increasing the yield per unit area and optimizing the variety mix, and increase the country's grain production capacity. 我们要切实稳定种植面积，着力提高单产，优化品种结构，推进全国新增粮食生产能力建设。3us