to avoid polluting environment
避免污染环境
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It may avoid stopping transportation and polluting city environment to have excavation in the open replaced by shallow-concealed excavation for large scale underground cable tunnel construction.
采用浅埋暗挖法施工地下电缆隧道取代明沟开挖法，可避免阻断交通、污染城市环境。
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