With acoustic resonance box and beater.
另附共鸣箱及击槌。
In this sense the library can be seen as a resonance box.
从这个意义上来说，图书馆可以看作一个共鸣箱。
The resonance frequency of cargo boxes on each floor is difference with single cargo of box when household appliance pallet units are in multi-layer stacking.
家电产品的托盘货物单元采用多层堆码时，各层货箱的共振频率不同于单一货箱的。
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