spark-gap

例句：

1. 1.The spark-gap between the two teams is narrow.
   两队之间的火花间隙很窄。
2. 2.The scientist discovered a new spark-gap in the universe.
   科学家在宇宙中发现了一个新的火花间隙。
3. 3. The gap between the two countries has widened over the years.
   两国之间的差距多年来已经扩大了。