protective spark gap

• 保护火花隙

protective spark gap的用法和样例：

例句

1. Interestingly, these T-R cavities employ old-fashioned spark gaps, complete with ozone smells and crackling sound tones.
   有趣的是这些收发开关里头使用的旧式火花隙会生成臭氧并发出轻微的爆裂声。
2. The installation of an air gap and drain line are recommended.
   建议安装气隙和排放管道。
3. This would create an air gap to eliminate any possible backflow.
   这将产生一个气隙以消除任何可能的回流。