Since 2004, the global demand of petroleum has increased greatly, especially the demand of sweet crude, which caused the historically high price difference between sweet crude and sour crude.是什么意思_Since 2004, the global demand of petroleum has increased greatly, especially the demand of sweet crude, which caused the historically high price difference between sweet crude and sour crude.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句