 |
| |||
| 附环 | |||
| 压圈 | |||
| 随动圈; 从动环; 随动环 | |||
| |||
| 附圆环; 随动圈; 压圈; 从动环 | |||
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follower ring : 10 phrases in 4 subjects |
| Hydroelectric power stations | 1 |
| Plastics | 4 |
| Technology | 4 |
| Water resources | 1 |
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