... period of satellite 卫星周期卫星周期 period of seasonal area 季节区的月份 period of service 服务期 ...
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The ground water level and Salinity of soil in the Hetao irrigated area in the Inner Mongolia exit notable seasonal changes and the peak period of salt deposit occurs in spring and autumn.
内蒙古河套灌区地下水位与土壤盐分存在明显的季节性变化，春、秋两季为积盐高峰期。
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