以下为句子列表：
英文: A large percentage of manholes are usually flooded, and some corrosive pollutants containing in the flooded manhole may corrode the metal cable closure and therefore cause severe problem in the telephone cable plant.
中文: 由于大多数的人孔经常充满来自于周围环境的地下水，若有侵蚀性物质意外流入人孔，可能导致人孔内之铅管接头加速腐蚀而影响其长期使用的安定性。
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英文: Abstract: In this paper,the pollution sources and the hazards of the pollutants in nitrotoluene production are briefly described,the various approaches for reducing and eliminating the pollution by adoption of cleaner production are outlined.
中文: 文摘:简介一硝基甲苯生产过程中污染物的产生和危害，概述了采用清洁生产技术减少和消除污染的各种途径。
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英文: Abstract: The recent progresses of the electrochemical techniques,such as direct electrolysis,indirect electrolysis and electroadsorption,for remediation of organic pollutants in water were reviewed.And the prospective research work was indicated.
中文: 文摘:介绍利用直接电解、间接电解和电化学吸附等方法去除水中有机污染物的研究现状，并指出今后的工作方向。
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英文: Abstract: This paper systematically analyzed the problems of air pollution,the variety of pollutants and their harms to mankind and environme nt,pointed out that air pollution was one of main factors to inhibit city's sust ainable development,described th
中文: 文摘:本文系统分析了城市空气污染的成因、污染物种类和危害，指出城市空气污染是制约城市可持续发展的关键因素之一，提出了城市空气污染防治的技术和非技术措施。
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英文: Aimed at the feature of great fluctuation of water flow-rate in rivers and taking the monthly average flow-rate at low water with 90% guaranty in recent ten years as design flow-rate, the permissible amount of major pollutants discharged into Yellow River
中文: 摘要针对河水流量变化大这一特点，采用以对数正态分布理论为指导的随机计算模式，以近十年90%保证率最枯月平均流量为设计流量，确定黄河兰州段主要污染物的容许排污量，即随机水环境容量。
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