The primary principle of backing up your data is that any important data should exist in two or more physical locations at once.
备份数据的主要原则就是所有你认为重要的数据都有两份以上的物理备份。
Carpet backing (primary) -the base fabric on which pile yarns are tufted an anchored to make a carpet.
一级地毯底布：在底布上面铺上层层纱线，最后组成簇绒地毯。
Carpet backing (primary) -the base fabric on which pile yarns are tufted an anchored to make a carpet.
一级地毯底布：在底布上面铺上层层纱线，最后组成簇绒地毯。
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