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缺 环 : 24 phrases in 14 subjects |
| Agriculture | 2 |
| Aviation | 1 |
| Biology | 1 |
| Biotechnology | 1 |
| Dermatology | 1 |
| Earth sciences | 1 |
| Ecology | 2 |
| General | 2 |
| Life sciences | 1 |
| Oil / petroleum | 3 |
| Scientific | 2 |
| Space | 2 |
| Surgery | 1 |
| Technology | 4 |
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