然后详细介绍了MPLS的核心概念，讲解了MPLS的协议模型、转发原理和双平面结构。
Then it specifies the kernel concept of MPLS, explains MPLS protocol model, transmit principle and double plane structure.
平面条形双异质结激光器的模式和阈值电流特性可以用两维波导模型来分析。
The mode and the threshold current characteristics of planar stripe geometry DH lasers can be analyzed by two-dimensional waveguide model.
将一类平面磨床主轴系统简化为耦合双弹性梁结构，用模态综合法建立其动力学模型。
Let the spindle system of a kind of plane grinding machine be simplified to a structure of coupled double-elastic beam and using modality synthetic method to establish its dynamic model.
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