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。
Besides, during the ceremony, it is not possible to avoid polluting the environment.
除此之外，在举办庆典的过程中，要想避免污染环境是不可能的。
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