How could one explain this difference in mass?
那么要如何解释质量上的这个差异呢？
The main difference is between mass production or handmade.
之间的主要区别是大规模生产或手工制作的。
Although taking difference storage can save a mass of storage space, version accesses slowly.
若采用差值存储虽然可以节省大量的存储空间，版本的存取速度要受影响。
Although taking difference storage can save a mass of storage space, version accesses slowly.
若采用差值存储虽然可以节省大量的存储空间，版本的存取速度要受影响。
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