With decrease of cropland and increase of population, food problem in our country is becoming more and more severe.
随着耕地的减少和人口的增加，我国粮食问题日趋严峻。
With the increasing use of big power electronic equipments and the non-linear loads in power system, the power quality problem is becoming more and more severe.
随着电力系统中各种大型设备和电力电子装置等非线性元件的应用越来越多，电能质量问题日益严重。
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