FZ Ball Retainer This is copper or aluminum or plastice based material, on which therollers are arranged oderly in certain angle and intervals.是什么意思_FZ Ball Retainer This is copper or aluminum or plastice based material, on which therollers are arranged oderly in certain angle and intervals.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句