求翻译：针对圆柱滚子轴承乙型保持架排屑孔加工困难的情况，设计了专用夹具，采用特殊的加工方法，保证了加工质量是什么意思？

For cage of cylindrical roller bearing with chip machining difficult situations, designing special jig, the use of special processing methods, ensuring the quality