They appear ready to support the more aggressive timetable in exchange for the certainty of a single national fuel-economy standard, instead of a jumble of federal and state standards.是什么意思_They appear ready to support the more aggressive timetable in exchange for the certainty of a single national fuel-economy standard, instead of a jumble of federal and state standards.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句