It is necessary to know its proportion of the two kinds of pollution in the region for more pertinency for pollution prevention measures during the practical environmental protection.
It is necessary to know its proportion of the two kinds of pollution in the region for more pertinency for pollution prevention measures during the practical environmental protection.
在现实环境保护工作中，为了使污染防治措施更有针对性，有必要了解区域内两类污染各自所占的份额。