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| 环形孔掏槽 | |||
| 扇形孔掏槽 | |||
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| 环切口 | |||
| ring cut: 20 phrases in 10 subjects |
| Automobiles | 2 |
| Compressors | 3 |
| Electronics | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
| General | 1 |
| Rail transport | 1 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 7 |
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