异面(背腹型)：指上下表面结构具有明显差异。
Dorsiventral Describing a structure that has distinct upper and lower surfaces.
考虑一均匀各向同性薄板结构，在其上下表面离散分布着压电执行元件。
An uniform distribution, isotropic thin plate, on which both surface there are discrete distribution piezoelectric actuators, is considered.
研究了金属板的上下表面附近各放置一层按周期排列的电介质小球的体系的光学性质。
Optical properties of a system composed of a metal slab with two planes of periodically arranged dielectric spheres on the metal surface have been investigated.
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