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| сокр.; parts per trillion | |||
| 万亿分: 20 phrases in 8 subjects |
| Animal husbandry | 2 |
| Chemistry | 1 |
| Earth sciences | 3 |
| Ecology | 2 |
| Electronics | 4 |
| General | 2 |
| Oil / petroleum | 2 |
| Technology | 4 |
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