这是夹心层的概念。
请记住，上面两层的仓库设计是概念仓库布局。
Keep in mind, the two-tier warehouse design above is a conceptual warehouse layout.
产品五层次结构理论实际上是一个双向动态的产品概念。
The theory of five product levels is in fact a two -way dynamic product concept.
对于纱系列的婚纱，往往“层”这个概念很重要。
For the marriage gauze, often yarn series "layer" this concept is very important.
有些则展现了某种技术概念，管理层希望就此测试媒体和公众的反应。
Some present a technology idea that executives want to road-test with the press and public.
结构层寿命匹配的概念；
分类阶段从根开始，按照决策树的分类属性逐层往下划分，直到叶节点，获得概念。
Decision Tree Apply Model to Test Data Test Data Start from the root of...
分类阶段从根开始，按照决策树的分类属性逐层往下划分，直到叶节点，获得概念。
Decision Tree Apply Model to Test Data Test Data Start from the root of...
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