仅仅在两侧安放压电层和薄薄的同心金属层是起不了多大作用的，因为金属的粘度很低。
Simply flanking the piezoelectric layer with thin concentric layers of metal would not work because metals tend to have a low viscosity.
只要我们同心协力和持之以恒，种族和谐的关系必定能在将来更上一层楼。
With concerted and sustained efforts by all concerned Singaporeans, racial harmony should attain a new dimension in the society.
在此模型中，把非均匀等离子体球分成若干个同心等离子体球壳，并且假定每一个同心壳层内等离子体密度均匀分布。
In this model, the nonuniform sphere is modeled by Numbers of concentric spherical shells, and each has a fixed electron density.
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