As a business_level professional amplifier, its service life is three times more than the average.

营业版级专业扩大机，质量佳，寿命比一般多三倍。

youdao

As a business_level professional amplifier, its service life is three times more than the average.

营业版级专业扩大机，质量佳，寿命比一般多三倍。

youdao