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| |||
| 双重故障 | |||
| 两次发球失误; 双误 | |||
| 两次失误; 双方犯规 | |||
| |||
| 双重故障 | |||
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double fault : 15 phrases in 4 subjects |
| Electricity generation | 1 |
| Electronics | 9 |
| Technology | 4 |
| Wind Energy | 1 |
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