hard surface

汉语翻译

英语解释：

动词 hard surface:

1. cover with asphalt or a similar surface

例句：

1. 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 *