铁路安全标兵范文:急求高手翻译！小弟拜谢了。翻译的好还会追加。

Technological advances in physical, chemical, and biological processing of water and wastewater during the early part of the 20th century led to the "Era of Wastewater Reclamation, Recycling, and Reuse". Since the 1960s. Intensive research efforts, fueled by regulatory pressures and water shortages, have provided valuable insight into health risks and treatment system design concepts for water reuse engineering. In 1965, the Israeli Ministry of Health issued regulations to allow the reuse of secondary effluents for for crop irrigation with the exclusion of vegetable crops that are eaten uncooked. In 1968 extensive research on direct potable reuse was conducted in Windhoek, Namibia. In the US, a milestone event was the passage of the Federal Water Pollution Control Act in 1972 {PL 92-500) "to restore and maintain the chemical, physical, and biological integrity of the Nation's waters" with the ultimate goal of zero discharge of pollutants into navigable, fishable, and/or swimmable waters. During the 1970s and 80s, the potential for health risks and technological requirements for nonpotable and potable reuse were studied intensively. These research efforts have resulted in increased implementation of wastewater reuse projects in various regions and the evolution of new reuse alternatives. A particularly noteworthy event was the publication of "Guidelines for Water Reuse" by the US. EPA and Office for International Development (1992).