碳化物

例句：

1. 1. The steel is carbonized to make it stronger and harder.
   钢铁被碳化以提高其强度和硬度。
2. 2. Carbonization is a process that occurs during the formation of diamonds.
   碳化是钻石形成过程中的一个过程。
3. 3. The graphite was used in the construction of early aircraft engines.
   石墨用于早期飞机引擎的建设。