The only major difference for the data storage layer is the implementation language.
数据存储层唯一的一个大的区别是所用的实现语言。
Behind the front end is a layer of middleware that I call the storage logic.
在前端后面是一个中间件层，我将它称作存储逻辑。
Underground storage layer, equipment space, between the top with water.
层 储藏、设备用房，顶层设有水箱间。
Underground storage layer, equipment space, between the top with water.
层 储藏、设备用房，顶层设有水箱间。
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