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手信号 : 44 phrases in 14 subjects |
Agriculture | 1 |
Aviation | 2 |
Baseball | 1 |
Business | 1 |
Communications | 2 |
Electronics | 3 |
General | 7 |
Information technology | 1 |
Project management | 1 |
Shipbuilding | 1 |
Sports | 1 |
Submarines | 1 |
Technology | 21 |
Waterskiing | 1 |