The model is divided into three layers: parts layer, feature layer and geometry layer.

模型分为三个层次：零件层、特征层、几何层。

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The software architecture was divided into three layers, task layer system layer and servo layer.

控制软件划分为任务层、系统层和伺服层。

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The index system with 32 indexes is divided into three layers. They are system layer, structure layer and datum layer.

指标体系分三层：系统层、结构层、数据层，共32个指标。

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The outer layers are made of acrylic plastic and the vacuum chamber in the middle is divided into three or four watertight compartments stacked on top of one another.

ECONOMIST: Cataracts