But the United States and other Western countries seem to be near the top of a Kuznets curve for carbon emissions and ready to start the happy downward slope.是什么意思_But the United States and other Western countries seem to be near the top of a Kuznets curve for carbon emissions and ready to start the happy downward slope.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句