The frictional drums may be fall into the single frictional drums withaut ditehes and the double frictional ones with multiple circular ditches.是什么意思_The frictional drums may be fall into the single frictional drums withaut ditehes and the double frictional ones with multiple circular ditches.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句