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| maximum concentration | |||
| 最 高 浓度: 28 phrases in 13 subjects |
| Agriculture | 1 |
| Animal husbandry | 1 |
| Automobiles | 1 |
| Drilling | 1 |
| Earth sciences | 5 |
| Ecology | 2 |
| Environment | 1 |
| General | 1 |
| Oil / petroleum | 1 |
| Oil processing plants | 3 |
| Space | 1 |
| Sports | 1 |
| Technology | 9 |
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