nature of coal

例句：

1. 1. The quality of the coal is determined by its composition and temperature.
   煤炭的质量由其组成和温度决定。
2. 2. The mine manager was asked to explain the nature of the coal deposits in the area.
   矿长被要求解释该地区煤炭矿床的性质。
3. 3.The company's research team has identified several new minerals with unique nature of coal.
   该公司的研究团队已经识别出几种具有独特性质的新矿物。