amplification

The stadium's sound amplification system ensured that every fan could hear the announcement.

(Chinese) 体育场的扩音系统确保每位歌迷都能听到公告。

Without proper amplification, the singer's voice would be lost in the noisy hall.

(Chinese) 如果没有适当的扩音，歌手的声音会淹没在嘈杂的大厅里。