| 单词 | protective wall |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔parapet〕A low protective wall or railing along the edge of a raised structure such as a roof or balcony.低矮挡墙：一种沿着如屋顶或阳台而建的低矮的护墙或栏杆美国传统〔sandbag〕A bag filled with sand and used as ballast, in the formation of protective walls, or as a weapon.沙袋：装满沙土的袋子，用作压载物以筑造防护堤，或者作为武器美国传统 |
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