 |
| |||
| 圆形码头; 圆柱墩 | |||
| 圆筒形码头; 圆筒墩; 圆柱形桥墩 | |||
| cylinder pier: 6 phrases in 3 subjects |
| Bridge construction | 1 |
| Hydroelectric power stations | 1 |
| Technology | 4 |
|
| |||
| 圆形码头; 圆柱墩 | |||
| 圆筒形码头; 圆筒墩; 圆柱形桥墩 | |||
| cylinder pier: 6 phrases in 3 subjects |
| Bridge construction | 1 |
| Hydroelectric power stations | 1 |
| Technology | 4 |