本文试图就化工厂噪声对城市环境的影响作出估价，并主要讨论了评价方法。
This paper attempts to value the effect of noise from chemical plants on urban environment and dealt with the evaluation method.
在一定条件下可以用来估价这些元素的环境暴露量及其对人体健康的影响。
Under certain conditions, the trace elements levels in human hair can be used to evaluate the human exposure in surrounding environment as well as the environmental impact on human health.
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