How to lower the phosphate has been the important task of protecting the water.
如何减少废水中的磷酸盐排放量,已成为保护水体的重要课题。
The energy sources crisis and environment damage are one of the important task at present.
能源危机、环境破坏是当今社会重要的课题之一。
The oil pump has the important task of delivering an adequate volume of oil around the engine at a suitable pressure.
机油泵一个重要的任务是给发动机提供足够量的、压力适当的机油。
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