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| hueco n; oquedad f; cavidad f; vacío m; puerro m; hoyo m; agujero m | |||
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| cueva n; caverna f; guarida f; gruta f | |||
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洞 : 22 phrases in 6 subjects |
| Antennas and waveguides | 5 |
| General | 10 |
| Nuclear physics | 1 |
| Radiology | 1 |
| Thermal Energy | 4 |
| Vacuum tubes | 1 |
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