| |||
public-address system | |||
public address system | |||
amplification system | |||
sound amplification system; sound amplifying system | |||
| |||
public address system |
扩 音 系统 : 11 phrases in 5 subjects |
Advertising | 1 |
Communications | 1 |
Electronics | 4 |
Technology | 4 |
Telecommunications | 1 |