Simply flanking the piezoelectric layer with thin concentric layers of metal would not work because metals tend to have a low viscosity.
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。
2
Concentric internal rotation work did not increase in either group.
两组的同轴内部旋转都没有得到增加。
3
Isokinetic dynamometry has been used to quantify shoulder muscle imbalance by determining an eccentric external rotation-to-concentric internal rotation "total work ratio."