I used this strategy to test the PetStore or mapping layer.
我就使用这种策略来测试PetStore或or映射层。
ActiveRecord is not a full object relational mapping layer.
ActiveRecord并非全对象关系型映射层。
One interesting layer is the "mapping layer" that is emerging in mobile social networks.
“定位绘图层”是随着移动社交网络的兴起而出现的一个有趣的层面。
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