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缓冲环 : 12 phrases in 9 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Compressors | 1 |
| Electronics | 1 |
| Footwear | 1 |
| Information technology | 2 |
| Multimedia | 1 |
| Rail transport | 1 |
| Technology | 3 |
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