Drought is a frequent natural disaster in Hebei province. Drought Information Sub center is established with the unit of city, which consists of drought monitoring system and analysis system.
旱情是河北省多见的自然灾害，旱情分中心建设是以设区市为单元进行的旱情信息监测与分析系统的建设。
Just as natural ecosystem, this is an interaction and interdependent relationship, forming a complete unit through circulation and flow of energy substance and information.
与自然生态系统一样，这是一种相互作用和相互依存的关系，通过能量、物质和信息的反复循环和流动，构成一个有机的整体。
Just as natural ecosystem, this is an interaction and interdependent relationship, forming a complete unit through circulation and flow of energy substance and information.
与自然生态系统一样，这是一种相互作用和相互依存的关系，通过能量、物质和信息的反复循环和流动，构成一个有机的整体。
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