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| кольцевая структура | |||
| кольцевидная структура | |||
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环结构 : 23 phrases in 11 subjects |
| Antennas and waveguides | 1 |
| Business | 1 |
| Chemistry | 1 |
| Electronics | 2 |
| General | 5 |
| Geology | 2 |
| Medical | 1 |
| Oil / petroleum | 2 |
| Oil processing plants | 1 |
| Technology | 6 |
| United Nations | 1 |
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