yǎn / chàng / huì / shǐ / yòng / kuò / yīn / shè / bèi / ràng / zuì / hòu / yì / pái / de / guān / zhòng / yě / néng / tīng / qīng / chǔ

演唱会使用扩音设备，让最后一排的观众也能听清楚。

The concert used amplification equipment so that even the audience in the last row could hear clearly.