The exercise machine includes a base frame (50), a drive unit (60), an undulator (RD), and a floorboard (80) .是什么意思_The exercise machine includes a base frame (50), a drive unit (60), an undulator (RD), and a floorboard (80) .在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句