More than 60,000 small factories which seriously polluted the environment were shut down in 1996.
曾经严重污染环境的6万多家小工厂已于1996年关闭。
However, gas injection for enhancing oil recovery may cause asphaltene deposit, which seriously influences production.
然而，注气提高采收率有可能引起沥青质沉积，从而严重地影响生产。
However, gas injection for enhancing oil recovery may cause asphaltene deposit, which seriously influences production.
然而，注气提高采收率有可能引起沥青质沉积，从而严重地影响生产。
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