Self-retaining bearing units with large contact angle, outer rings held in a retention sleeve, pierced rollers and steel pin-type cages (fig 10).是什么意思_Self-retaining bearing units with large contact angle, outer rings held in a retention sleeve, pierced rollers and steel pin-type cages (fig 10).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句