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| reinforcement | |||
| enrichment; fortification | |||
| strengthening | |||
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| fortifications | |||
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Fortifications : 23 phrases in 10 subjects |
| Construction | 3 |
| Cultural studies | 1 |
| Food service and catering | 2 |
| General | 8 |
| Industry | 1 |
| Medical | 1 |
| Metallurgy | 1 |
| Patents | 2 |
| Technology | 3 |
| Transport | 1 |