They fill these tubes with gases that glow when electrified.
2018年6月四级真题（第一套）阅读 Section A
柯林斯高阶英汉双解学习词典释义
ADJ
通电的;带电的
An electrified fence or other barrier has been connected to a supply of electricity, so that a person or animal that touches it will get an electric shock.