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| backward bent vane; backward curved blade | |||
| back ward-curved blade | |||
| back-swept vane; backward curved vane | |||
| backward leaning vane; sweptback blade | |||
| 后 弯叶片: 17 phrases in 8 subjects |
| Architecture | 1 |
| Automobiles | 3 |
| Ecology | 1 |
| Metallurgy | 2 |
| Mining | 1 |
| Refrigeration | 2 |
| Technology | 6 |
| Wind Energy | 1 |
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