Service layer objects should not call the web layer, as layers should depend only on the layer immediately below them

服务层对象不应该调用Web层，因为各层应该只依赖直接处在其下方的层。

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Presentation layer objects will depend on service layer objects, which will themselves depend on other service objects and data access objects, etc.

表示层对象会依赖于服务层对象，而这些服务层对象又依赖于其它服务对象和数据访问对象等。

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In order to improve the tomographic image resolution of complex multi-layer objects, a complex spectral domain optical coherence tomography (CSD-OCT) system is established.

为了提高复杂多层样品层析图像的分辨率，构建了复谱频域光学相干层析成像(CS OCT)系统。

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He then uses Adobe's Photoshop editing program to layer the images together and mask objects as needed to create the illusions.

CNN: Surrealist photographer recreates his dreams in real life

Additive manufacturing is the process of joining materials to make objects from 3D model data, usually layer upon layer.

WHITEHOUSE: Delivering on Manufacturing Innovation

The technology works by building up layer upon layer of material - typically plastic - to build complex solid objects.

BBC: Working gun made with 3D printer