游标模型天生就具备专用于维度结构的概念，而在关系场景中意义不大。
Naturally, the cursor model API has concepts that relate exclusively to dimensional structures and do not make much sense in relational scenarios.
大型零件通常是指那些在各个维度的尺寸超过一米的零件，比如蒸汽轮机的低压缸体，飞机的机翼壁板以及一些专用零件。
Large size parts generally refer to those parts with more than one meter long in each dimension, such as low-pressure cylinder of steam turbine, wing panel of plane and so on.
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