hold amplifier

例句：

1. 1. The engineer used a power amplifier to boost the signal strength.
   工程师使用一个功率放大器来增强信号强度。
2. 2. The audio equipment includes a variety of amplifiers for different applications.
   音频设备包括多种针对不同应用的放大器。
3. 3. The amplifier was designed to improve the sound quality of the music.
   这个放大器被设计用来提高音乐的声音质量。