As the number of layers increases in any application development project, the number of artifacts produced and the management of the systems that support the application also increase.
随着应用程序开发项目中的层次增加，生成的工件数量和支持应用程序的系统的管理也随之增加。
It provides a number of functions that are used by upper - and lower-level drivers and, therefore, serves as the glue between these two distinct layers.
它提供了很多可供较高层和较低层驱动器使用的函数，因而可以充当这两层间的连接层。
In the meantime, the number of freedom degrees doesn't increase with the number of layers in the laminate as it does in the conventional case.
同时由于单元的自由度数不随层数的增加而增加，避免了常规三维单元在分析复合材料层板时自由度数随层数的增加而增加的弊端。
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