| 单词 | 用作防御工事 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔Martello tower〕A short, circular tower, usually made of stone and located near a shoreline as a defensive fortification.圆形炮塔，碉堡：圆形的矮塔，通常为石制且靠近海岸线，用作防御工事美国传统〔bulwark〕A wall or embankment raised as a defensive fortification; a rampart.堡垒，壁垒：用作防御工事的墙或土堤；壁垒美国传统 |
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