指出，防治重金属污染，对保护土壤生态系统具有重大意义。
It points out that it is of great importance for protecting soil ecosystem to prevent and cure pollution of heavy metals.
指出麦草浆黑液污染治理近年虽已取得不少成绩，但它仍是造纸工业废水污染防治的难点及重点。
It is still the key point and hard job for wastewater pollution control of paper industry though the treatment of wheat straw pulping black liquor has achieved considerable successes.
指出了噪声污染环境的实际问题，提出了防治噪声污染的对策。
It points out the question concretly of polluting environment by noise and brings up the way to the prevention and control of the noise pollution.
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