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| 环形管线，回路 | |||
| 环形电路 | |||
| 环形电路 | |||
| 环路 | |||
| 环路【道】 | |||
| 环状电路; 振铃电路 | |||
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ring circuit : 20 phrases in 9 subjects |
| Chemistry | 1 |
| Compressors | 1 |
| Construction | 2 |
| Electric machinery | 4 |
| Electronics | 3 |
| Hydroelectric power stations | 3 |
| Space | 1 |
| Technology | 2 |
| Telecommunications | 3 |
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