采用夏闲期并苗期秸秆覆盖，能有效提高耕层土壤水分的数量水平和能量水平；
The levels both of amount and energy of soil water were remarkably raised by adoption of mulch with straw in seedling stage as well as in summer fallow time in some cases.
由于技术水平的限制，夏级从未部署到近海以外的地方。
Due to its technical limits, the Type 092 is never deployed outside regional waters.
四大岛水平分为春，夏岛，秋岛，冬岛要点。
The four major levels divided into Spring Island, Summer Island, Autumn Island, Winter Island major points.
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