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| 圈形四合钮 | |||
| ring snap: 58 phrases in 14 subjects |
| Automobiles | 12 |
| Aviation | 1 |
| Compressors | 2 |
| Construction | 1 |
| Drilling | 5 |
| Electric machinery | 3 |
| Mechanics | 1 |
| Metallurgy | 2 |
| Mountaineering | 1 |
| Oil / petroleum | 1 |
| Rail transport | 1 |
| Space | 3 |
| Technology | 21 |
| Textile industry | 4 |
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