A thin board forming the upper portion of the resonantchamber in an instrument, such as a violin or piano, and serving to increase resonance.
乐器的共鸣箱的上面部分的一种薄板，如小提琴或钢琴中者，用于增大响亮程度。
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The results can provide a basis for applying the resonantchamber to enhance heat transfer, which has practical significance on rebuilding lots of heat exchangers.