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bar-spring clips |
弹条 : 54 phrases in 14 subjects |
Air defense | 3 |
Automobiles | 3 |
Aviation | 5 |
Bridge construction | 2 |
Business | 3 |
Compressors | 1 |
Construction | 1 |
Cryptography | 1 |
General | 1 |
Metallurgy | 2 |
Rail transport | 3 |
Space | 11 |
Technology | 17 |
Toys | 1 |