I changed from a standard stamped metal ball retainer to a high speed precision molded plastic one that could be removed by skaters to allow better cleaning of the bearing.是什么意思_I changed from a standard stamped metal ball retainer to a high speed precision molded plastic one that could be removed by skaters to allow better cleaning of the bearing.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句