这些国家可以通过开垦新的耕地来增加粮食产量。
These countries could presumably boost food output by taking in some new land.
本文通过试验证明了栽培玉米增施化学肥料既可以提高粮食单产，又可随着粮食产量的增加而增多玉米根茬的数量。
Experiment showed that fertilizer application could increase not only the yield of maize but also the quantity of Its roots.
本文通过试验证明了栽培玉米增施化学肥料既可以提高粮食单产，又可随着粮食产量的增加而增多玉米根茬的数量。
Experiment showed that fertilizer application could increase not only the yield of maize but also the quantity of Its roots.
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