Planting wheat without tillage after maize harvesting is a hard problem through the extension of conservation tillage technology system in the district of two crops one year in north China.
在我国北方一年两熟地区推广实行保护性耕作技术体系过程中，玉米收获后免耕播种小麦是一直困扰的难题。
That, without any exaggeration, was exactly how I returned to China, after a four-year absence;
我阔别中国四年以后，就这样又回到那里，这丝毫没有夸张的成份。
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