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| 总酸 | |||
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total acid : 21 phrases in 10 subjects |
| Animal husbandry | 5 |
| Automobiles | 1 |
| Aviation | 1 |
| Chemistry | 1 |
| Ecology | 2 |
| Food service and catering | 1 |
| General | 1 |
| Oil processing plants | 1 |
| Space | 1 |
| Technology | 7 |
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