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| expansion ring | |||
| expansion loop | |||
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| expander ring; expanding ring | |||
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膨胀环 : 27 phrases in 12 subjects |
| Automobiles | 3 |
| Aviation | 2 |
| Drilling | 2 |
| Ecology | 1 |
| Economy | 2 |
| Electric machinery | 1 |
| International trade | 1 |
| Nautical | 1 |
| Project management | 1 |
| Refrigeration | 4 |
| Space | 2 |
| Technology | 7 |
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