| |||
major structure | |||
primary structure component | |||
main member | |||
leading frame; primary component; primary member | |||
| |||
main member |
主构件 : 31 phrases in 8 subjects |
Agriculture | 1 |
Architecture | 1 |
Aviation | 4 |
Hydroelectric power stations | 3 |
Nautical | 14 |
Space | 3 |
Technology | 4 |
Wind Energy | 1 |