工程师安装了一个减震器来降低机器的震动。

The engineer installed a ___damper to reduce the machine's vibrations.

调节炉子通风时，记得调整烟囱里的挡板。

Remember to adjust the ___damper in the chimney when regulating the stove's airflow.

接连不断的雨天给我们的野餐计划泼了冷水。

The continuous rainy days put a ___damper on our picnic plans.