4周搞定2000+托福核心词
轮作
crop rotation
常考释义
n. 轮作
And no matter which tillage or crop rotation system was used, nitrous oxide emissions peaked during spring thaws when the sun’s rays began to warm the soil.
不管应用哪种耕作法或者作物轮作制度,在春雪融化时,也即太阳光开始把土壤烘暖时,一氧化二氮的排放量总是达到高潮。
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