One key focus of cloud storage is cost.
云存储的一个重点是成本。
Further more, the cost of different storage device varies greatly.
此外，不同存储设备的成本也相差甚远。
The cost of digital storage has also fallen dramatically.
数码存储的成本也下降得非常大。
The cost for storage and maintenance of a functional index can be high.
函数索引的存储和维护成本较高。
The cost for storage and maintenance of a functional index can be high.
函数索引的存储和维护成本较高。
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