1. The thermionic tube is a type of vacuum tube that contains hot cathodes for electron emission.
热电子管是一种真空管，其包含有用于发射电子的热阴极。

2. Thermionic tubes were commonly used in early radio and television technology.
热电子管在早期的无线电和电视技术中被广泛使用。

3. The thermionic tube is essential for amplifying and controlling electronic signals.
热电子管对于放大和控制电子信号至关重要。

4. Many vintage audio amplifiers still utilize thermionic tubes for their warm and rich sound quality.
许多老式音频放大器仍然使用热电子管来获得温暖而丰富的声音质量。

5. The invention of the thermionic tube revolutionized the field of electronics.
热电子管的发明彻底改变了电子领域。

6. Engineers continue to study and improve thermionic tube technology for various applications.
工程师们继续研究和改进热电子管技术，用于各种应用。