coal spontaneous combustion tendency

例句：

1. 1.The coal mine is prone tospontaneous combustion due to thehigh moisture content in the coal.
   由于煤炭中水分含量高，煤矿容易发生自燃。
2. 2. The research on the spontaneous combustion tendency of coal is crucial for thesafety of coal mining operations.
   研究煤炭的自燃倾向对于煤炭开采作业的安全至关重要。
3. 3.To prevent spontaneous combustion, itis important to maintain a dry environment aroundthe coal pile.
   为了预防自燃，需要保持煤炭堆周围干燥的环境。