Primary Master

• 第一主盘； 主硬盘

Primary Master的用法和样例：

例句

1. By attaching the connecting rods to a master disk surrounding the crankpin, as many as twelve cylinders have been made to work on a single crankpin.
   通过把连杆连接到包住曲柄销的一个主盘上，十二个气缸便可在同一个曲柄销上工作。