A further switch activates the Downhill Speed Regulation (DSR) system, which automatically maintains a pre-programmed speed on steep downhill inclines.是什么意思_A further switch activates the Downhill Speed Regulation (DSR) system, which automatically maintains a pre-programmed speed on steep downhill inclines.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句