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| 密封件旋转环 | |||
| 动环 | |||
| 镜板 | |||
| 回转钢领 | |||
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rotating ring : 12 phrases in 8 subjects |
| Automobiles | 1 |
| Chemistry | 2 |
| Compressors | 2 |
| Electric machinery | 2 |
| Hydroelectric power stations | 2 |
| Mechanics | 1 |
| Nuclear and fusion power | 1 |
| Technology | 1 |
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