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。
The land quantity, the mass variation are remarkable also the existence obvious region difference.
质量变化显著且存在明显的区域差异。
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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