物理数据建模应用物理约束，如空间、性能以及数据的物理分布。
The physical data modeling applies physical constraints, such as space, performance, and the physical distribution of data.
一旦这些约束消失了，我们就会缺乏构建简单分布式应用程序所需的带宽、工具或技能。
Once those constraints were gone, we lacked the bandwidth, tools, or skill to build simple distributed applications.
相应的广义质量矩阵既决定于体系的质量分布，又决定于几何约束特性。
The corresponding generalized mass matrix depends on both the mass distribution and the geometrical constraint characteristics of the system.
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