relay mirror
| experiment
| relay mirror | |
| space | 中继镜 |
| experiment | |
| gen. | 进行实验 |
| environ. | 实验 |
| math. | 试验，试探 |
| met. | 科研设备; 科学仪器 |
| oil | 实验 |
| scient. | 进行试验 |
| space | 科研 设备 |
| sport. | 进行实验 |
| tech. | 试验 |
| |||
| 中继镜 | |||
|
relay mirror : 8 phrases in 4 subjects |
| Air defense | 1 |
| Automobiles | 1 |
| Aviation | 1 |
| Space | 5 |