In the past certain manufacturers have attempted to use Beryllium for the construction of a direct radiating tweeter dome.
过去，某些制造商试图利用铍来建造直接辐射式高音单元穹顶。
In the past certain manufacturers have attempted to use Beryllium for the construction of a direct radiating tweeter dome.
过去，某些制造商试图利用铍来建造直接辐射式高音单元穹顶。
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