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单齿轮 : 49 phrases in 13 subjects |
| Agriculture | 1 |
| Automobiles | 7 |
| Chemistry | 2 |
| General | 1 |
| Hydroelectric power stations | 3 |
| Metallurgy | 1 |
| Nautical | 3 |
| Oil / petroleum | 1 |
| Rail transport | 4 |
| Shipbuilding | 1 |
| Steel production | 1 |
| Technology | 21 |
| Wind Energy | 3 |
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