Most often, the goal of this migration is to offload less frequently-used data to less expensive external devices for long term storage.
在很多时候，此类移植的目标都是将不太常用的数据转储到更便宜的外部设备上进行长期存储。
The shelving Spaces are used for the storage of reading and writing materials, and often for materials that are used periodically - these are kept on the upper shelf units.
架子空间用于读写材料的存储，经常用于存储定期使用的材料—这些保存在上层格子里。
Electric golf cart batteries are one type of relatively inexpensive deep-cycle battery that is often used for energy storage in smaller PV systems.
电动高尔夫球车使用的蓄电池是一种比较便宜的深循环蓄电池，通常应用于小型光伏系统中储存能量。
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