从历史上看，缺氮，不缺土地或不缺水，一直是农业最大的制约因素。

Historically, lack of nitrogen, not lack of land or water, has been its biggest constraint.

youdao

从历史上看，缺氮，不缺土地或不缺水，一直是农业最大的制约因素。

Historically, lack of nitrogen, not lack of land or water, has been its biggest constraint.

youdao