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expansion ring | |||
expansion loop | |||
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expander ring; expanding ring |
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 |