carbon content in coal的用法和樣例：
例句
- A more promising technique for early detection focuses on changes in carbon isotopes in carbon dioxide.
有一種較被看好的預先偵測技術(shù)，是以二氧化碳中碳同位素的變化做為分析重點(diǎn)。 - High steam carbon ratios were required to prevent carbon formation in the reformer tubers.
為了防止重整管中碳的形成，蒸汽與碳的比率需要非常高。
