isogram of ash content

例句：

1. 1. The coal is mainly composed of ash content.
   煤主要由灰分含量组成。
2. 2. The analysis of the ash content in the coal is crucial for the production process.
   煤中灰分含量的分析对生产过程至关重要。
3. 3. The ash content of the coal can affect its combustion efficiency.
   煤的灰分含量会影响其燃烧效率。