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| air return vent | |||
| exhaust inlet; return air grill; return inlet | |||
| air return inlet; air return opening; return air inlet; return air intake; return intake | |||
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回风口 : 17 phrases in 5 subjects |
| General | 1 |
| Metallurgy | 3 |
| Refrigeration | 7 |
| Technology | 5 |
| Wind Energy | 1 |
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