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但是近年来外来水生生物物种引发了多起生态灾难事件，对生态环境安全构成了严重威胁。
But in recent year, many ecological disaster events has been initiated by aquatic organisms from foreign area, posing serious threat to ecological environment security.
运用系统分析的理论与方法，分析了中国水生态系统的特征及各组分间的相互作用，建立了中国水安全动态模型。
China water security dynamic model were built up based on the systematical analyses of characteristics and their inter relationship of sub systems of water resource system in China.
水生甲壳动物在水生态系统和环境安全评价中居于重要的地位，它们对存在于水中的外源化合物的影响非常敏感。
In the aquatic ecosystem and environmental safety evaluation, aquatic crustacean are of important position and function, and they are very sensitive to the effect of xenobiotics.
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