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层障 : 26 phrases in 13 subjects |
| Chemistry | 1 |
| China | 1 |
| Construction | 1 |
| Dermatology | 1 |
| Electric machinery | 1 |
| Genetics | 1 |
| Metallurgy | 7 |
| Nursing | 2 |
| Oil / petroleum | 1 |
| Otorhinolaryngology | 1 |
| Polo | 4 |
| Space | 2 |
| Technology | 3 |
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