围绕扩大天然气的传播将根据加州的上限和交易制度，以明年生效，这将增加至少50美分，至每百万英国热量单位的天然气为燃料的蒸汽成本。
The spread over natural gas will widen under California's cap and trade system, set to take effect next year, which will add at least 50 cents per million BTUs to the cost of gas-fired steam.
围绕扩大天然气的传播将根据加州的上限和交易制度，以明年生效，这将增加至少50美分，至每百万英国热量单位的天然气为燃料的蒸汽成本。
The spread over natural gas will widen under California's cap and trade system, set to take effect next year, which will add at least 50 cents per million BTUs to the cost of gas-fired steam.
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