Eradicating cultural garbage and purifying growing environment are the key to prevent youngsters crime.
铲除文化垃圾、净化成长环境是预防青少年犯罪的关键。
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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