现已有便携式电脑和功能单位，可以使用汽车电池、电力、水管，也适合在世界任何地方。
There are now available portable and compact units that can function with the use of car and battery power and mains that are also suited anywhere in the world.
前言：三十多年来，美国的水环境管理政策在实践中不断完善，使曾经受到严重污染的水环境逐步得到了修复，走出了一条世界闻名的“先污染后治理”的水管理道路。
The management policies of American water environment have been perfected continuously in practices in the past more than 30 years, which restored the serious polluted water environment step by step.
前言：三十多年来，美国的水环境管理政策在实践中不断完善，使曾经受到严重污染的水环境逐步得到了修复，走出了一条世界闻名的“先污染后治理”的水管理道路。
The management policies of American water environment have been perfected continuously in practices in the past more than 30 years, which restored the serious polluted water environment step by step.
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