| |||
| 回波 | |||
| 反射波 | |||
| 后向波 | |||
| ★ 反向波 | |||
| 反波 | |||
| ★ 返波 | |||
|
backward-wave : 75 phrases in 15 subjects |
| Air defense | 9 |
| Architecture | 1 |
| Aviation | 8 |
| Business | 1 |
| Electric machinery | 1 |
| Electronics | 17 |
| General | 2 |
| Geophysics | 4 |
| Gymnastics | 1 |
| Information technology | 1 |
| Metallurgy | 2 |
| Radio | 5 |
| Road construction | 1 |
| Space | 6 |
| Technology | 16 |