NRG executives think solving the IGCC riddles are worth the trouble because they expect the U.S. will soon limit the amount of carbon dioxide that power generators may emit.是什么意思_NRG executives think solving the IGCC riddles are worth the trouble because they expect the U.S. will soon limit the amount of carbon dioxide that power generators may emit.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句