Coal, petroleum and natural gas are unrenewable resources, so it is important to improve energy utilization and save mineral resources.
煤炭、石油、天然气都是不可再生资源，如何提高能源利用率、节约矿产资源显得更加重要。
Coal, petroleum and natural gas are unrenewable resources, so it is important to improve energy utilization and save mineral resources.
煤炭、石油、天然气都是不可再生资源，如何提高能源利用率、节约矿产资源显得更加重要。
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