Finally, trees have a great contribution in purifying air and make our environment be fresher.
最后，树木对于净化空气也做出了很大的贡献，使得我们的环境更清新。
Pollution of water resource, water environment and the technology of purifying water are regarded increasingly.
水资源与水环境的污染以及现代水处理技术是人们日益关心重视的研究课题。
Pollution of water resource, water environment and the technology of purifying water are regarded increasingly.
水资源与水环境的污染以及现代水处理技术是人们日益关心重视的研究课题。
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