 |
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| bastion; propugnaculum | |||
| counter approach; defence work; defensive work; fortification; outwork | |||
| earth work | |||
| Defensive works | |||
| |||
| military defence works | |||
| |||
| defence (设施); defense | |||
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| defence | |||
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| demi-bastion | |||
| 防御工事: 17 phrases in 4 subjects |
| General | 4 |
| Space | 1 |
| Technology | 9 |
| United Nations | 3 |