protective spark gap的用法和樣例：
例句
- Interestingly, these T-R cavities employ old-fashioned spark gaps, complete with ozone smells and crackling sound tones.
有趣的是這些收發開關裡頭使用的舊式火花隙會生成臭氧併發出輕微的爆裂聲。 - The installation of an air gap and drain line are recommended.
建議安裝氣隙和排放管道。 - This would create an air gap to eliminate any possible backflow.
這將產生一個氣隙以消除任何可能的迴流。
