Natural gas will become the preeminent fuel of the 21st century, according to widespread expectation.
Natural gas will become the preeminent fuel of the 21st century, according to widespread expectation.
许多专家预测，天然气将成为21世纪的主要燃料。
Natural gas will become the preeminent fuel of the 21st century, according to widespread expectation.
许多专家预测，天然气将成为21世纪的主要燃料。