master copy

英文解釋：

名詞 master copy:

1. an original creation (i.e., an audio recording) from which copies can be made
   同義詞：master, original

字典網

英文造句：

1. It controls how data and database are shared among users on the network and how users access master copies of data and application software on the centralized hard disk.
   它控制著網上用戶如何共享數據和資料庫，以及用戶如何存取中央硬碟上的數據和套用軟體的主拷備。