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观测点 : 111 phrases in 17 subjects |
| Agriculture | 1 |
| Animal husbandry | 1 |
| Automobiles | 1 |
| Chemistry | 1 |
| Desert science | 3 |
| Earth sciences | 1 |
| Electronics | 2 |
| Engineering geology | 2 |
| General | 1 |
| Geophysics | 1 |
| Management | 1 |
| Metallurgy | 2 |
| Nautical | 2 |
| Navigation | 2 |
| Oil processing plants | 1 |
| Space | 3 |
| Technology | 86 |
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