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| downdraft; downdraught (downdraft); downflow | |||
| upflow | |||
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竖流 : 64 phrases in 11 subjects |
| Automobiles | 6 |
| Ecology | 3 |
| Electric machinery | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| General | 1 |
| Hydroelectric power stations | 6 |
| Metallurgy | 1 |
| Oil / petroleum | 1 |
| Technology | 40 |
| Water resources | 3 |
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