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| |||
| headframe; headgear | |||
| shaft-head frame; shaft tower | |||
| head gear; shaft headframe; winding tower | |||
|
井塔 : 16 phrases in 7 subjects |
| Automobiles | 1 |
| Desert science | 1 |
| Drilling | 4 |
| Hydroelectric power stations | 1 |
| Oil / petroleum | 1 |
| Technology | 7 |
| Wind Energy | 1 |
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