| |||
public address set; public address system |
广播机 : 35 phrases in 11 subjects |
Aviation | 5 |
Construction | 1 |
Electronics | 9 |
General | 4 |
International trade | 1 |
Rail transport | 2 |
Shipbuilding | 3 |
Space | 1 |
Technology | 7 |
Telecommunications | 1 |
United States | 1 |