The results showed that the film covering had obvious effect on soil water conservation at the middle stage of corn growth, but neither at the earlier, nor later stage was obvious.
结果表明，地膜覆盖在玉米生育中期保水效果明显，而在生育前期和后期保水效果不明显；
Studied on the relationship between leaf area composition of population and photosynthetic production of rice at middle growth stage.
通过密肥试验，研究水稻生育中期群体叶面积组成与光合生产的关系。
The economic growth mostly depends on enhancing the productive factors when China is at a middle stage of the industrialization of national economy.
现阶段我国正处于国民经济工业化的中级阶段，经济增长主要靠生产要素投入的增加来推动。
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