Pupils of Nan primary school in old polluted area and Simono primary school in control area were selected as investigating subjects and health questionnaire survey were conducted.
通过健康调查表，对日本四日市旧污染区楠小学校及非污染物下野小学校的学生进行有关变态反应性疾病患病情况的流行病学调查。
During offshore drilling operation, a lot of wastes are produced, such as polluted water, gas, solid waste and harmful noise, which damage to the environment around the drilling operation area.
在海上钻井的生产过程中会产生大量的固体废弃物、废水、废气及噪声污染，将对作业海域造成一定的危害。
There is enough environment capability and self-cleaning action in this area, so the investigation area can be regarded as a non-polluted area.
长江口区及邻近海域具有较大环境容量和自净能力，故该调查区基本可视为未污染区。
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