Use no oil vacuum pump, avoid polluting the environment in the production.
使用无油真空泵，避免污染环境的生产。
Coal is even more polluting than oil, contributing even more to global warming.
煤甚至于比石油的污染还要大，尤其是考虑到全球气候变暖的情况。
Coal is even more polluting than oil, contributing even more to global warming.
煤甚至于比石油的污染还要大，尤其是考虑到全球气候变暖的情况。
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