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| 环路系统 | |||
| 环状系统; 环形网; 环形管网 | |||
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| 圈子制度; 在指定的圈子内减免税收的制度 | |||
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ring system : 33 phrases in 11 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Biotechnology | 1 |
| Chemistry | 1 |
| Electronics | 2 |
| Metallurgy | 1 |
| Navigation | 1 |
| Plastics | 1 |
| Refrigeration | 1 |
| Technology | 22 |
| Textile industry | 1 |
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