坚硬的

hard; stiff; callous; flinty; ironbound; marble; petrosal

1. （打火机用的）电石一种由能产生火星的、坚硬的合金小圆柱体，用于点燃打火机燃料
   A small solid cylinder of a spark-producing alloy, used in lighters to ignite the fuel.
2. 桁架用木棒或金属棒做成的坚硬的构架，用于支撑屋顶等结构
   A rigid framework, as of wooden beams or metal bars, designed to support a structure, such as a roof.
3. 金刚砂是非常坚硬的金属物质。
   The emery is a hard metallic substance.
4. 黑檀树是一种黑色而坚硬的树木。
   Ebony is a hard black wood.

坚的英语翻译：

硬的英语翻译：