Regarding economy, source of energy and environment as a whole, natural gas will become the fourth generation source of energy instead of crude oil in the twenty first century.

从经济、能源、环境整体来看，廿一世纪天然气将替代石油成为人类第四代能源。

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Regarding economy, source of energy and environment as a whole, natural gas will become the fourth generation source of energy instead of crude oil in the twenty first century.

从经济、能源、环境整体来看，廿一世纪天然气将替代石油成为人类第四代能源。

youdao