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自收缩 : 20 phrases in 10 subjects |
| Automobiles | 1 |
| Chemistry | 1 |
| Construction | 1 |
| Electronics | 2 |
| General | 3 |
| Metallurgy | 2 |
| Reproductive biology | 1 |
| Sports | 2 |
| Technology | 6 |
| Textile industry | 1 |
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