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。
THICK TO THIN: By controlling viscosity, various effects can be obtained.
厚到薄： 通过控制粘度，可以得到不同的效果。
The characteristics of heavy oil reservoirs are deep burial, thin bed, active edge water and high viscosity in Shengli Oilfield.
胜利油田的稠油油藏具有埋藏深、油层薄、边水严重以及原油黏度高等特点。
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