这样高的产量主要是通过改良耕作方法取得的。
These high yields have been achieved largely through better methods of cultivation.
目的观察改良高选择性迷走神经切断术治疗十二指肠溃疡急性穿孔的远期临床效果。
Objective to observe the long term clinical effect of modified highly selective vagotomy for acute perforated duodenal ulcer.
对于每穗粒数、千粒重等遗传力高的性状，可结合杂交育种工作采用有限回交同步改良。
High heritability traits such as grain number per panicle and weight per thousand grains can be improved synchronously by limited backcrossing in breeding procedures.
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