| |||
return ring | |||
pivoted loop; swivel | |||
slewing ring |
回 转环 : 28 phrases in 10 subjects |
Automobiles | 1 |
Bridge construction | 1 |
Compressors | 1 |
Earth sciences | 2 |
Engineering geology | 5 |
General | 1 |
Gymnastics | 6 |
Hydroelectric power stations | 2 |
Refrigeration | 1 |
Technology | 8 |