单词：hard surface
hard surface的用法和样例：
例句
- A small firework consisting of some gravel wrapped in tissue paper with a percussion cap that explodes when thrown against a hard surface.掼炮一种由草纸包住一些砾石制成的小型鞭炮，其打火帽在与坚硬表面撞击时发生爆炸
单词：hard surface 相关文章
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加州英语分级G6