为了节能，我们决定逐步降低办公室的空调温度。

To save energy, we decided to ___turn down the office air conditioning temperature gradually.

校长因健康原因辞去了职务。

The principal ___stepped down due to health reasons.

这个降压变压器将工业电压从380伏降至220伏。

The ___step-down transformer lowers the industrial voltage from 380V to 220V.