A large-scale computer cluster that has become increasingly important is the data center, also called warehouse-scale computers (WSCs), in which racks of computers and disks are networked and share power and cooling . Such systems typically include 50,000 to 100,000 computers, or serv ...
意思是现成的、即买即用的，且暗示不是定制化的。 If a product is off the shelf, it can be used straightaway without any setting-up. 如果要完全理解这个词的来历，可以用off the shelf that you can use it immediately. 省略了后面的话。 类似的还有off-the-peg （现成的（衣服）） ps：注意使用时中间加横线连 ...
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