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.

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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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