求翻译：位于中国东南部沿海的广东省深圳市由于受地形条件限制和降雨年内分配不均的影响，淡水资源匮乏，供水主要依靠境外引水、水库蓄水. 深圳市现有蓄水水库172座，小型水库居多，中型水库12座. 铁岗、石岩水库属于建成最早的中型水库，每年供水达4.85亿m3以上，汛期还可以联合调度两水库泄洪，是深圳市重要的供水与防洪调蓄库体[1]. 近年来，随着城市规模的扩大和人口的激增，铁岗、石岩水库水源保护区内的点源、面源、内源污染不断增多，导致水库水体中氮、磷含量较深圳市其他水库明显偏高[1]，属中营养型水体，对城市饮用水的安全具有潜在威胁.是什么意思？

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Is located southeast China coastal Guangdong Province Shenzhen because assigns in the topographical condition limit and the rainfall year the uneven influence, the fresh water resources are deficient, beyond the border the water supply main dependence pilots, the reservoir inpoundment. Shenzhen exis

Located in Eastern and southern coastal province of Guangdong, China Shenzhen due to terrain conditions and influence of uneven distribution of rainfall a year, lack of fresh water resources, water supply relies mainly on water diversion abroad, reservoir. 172 of existing water storage reservoir in