通过最新研制的消声器，凯士比公司成功将21年前生产的一台噪音很大的大型机泵的声音降低了20分贝。
With its newly developed diffuser, the KSB Group has managed to lower by 20 dB the noise emission of a large pump produced 21 years ago in what was then the GDR.
通过最新研制的消声器，凯士比公司成功将21年前生产的一台噪音很大的大型机泵的声音降低了20分贝。
With its newly developed diffuser, the KSB Group has managed to lower by 20 dB the noise emission of a large pump produced 21 years ago in what was then the GDR.
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