gain switch

例句：

1. 1. The gain switch on the remote controls allows you to adjust the volume level.
   遥控器上的增益开关允许你调整音量水平。
2. 2. During the manufacturing process, the gain switch is used to control the amplification of signals.
   在制造过程中，增益开关用于控制信号的放大。
3. 3. The gain switch can be adjusted to optimize performance in different environments.
   增益开关可以调整以优化在不同环境中的性能。