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| |||
| aperture rectangular rectangular configuration | |||
| rectangular opening (口); rectangular orifice (口); rectangular port (口) | |||
| 矩 形孔: 21 phrases in 6 subjects |
| Electronics | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 10 |
| Oil / petroleum | 4 |
| Radio | 1 |
| Technology | 4 |
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