Their research shows that 80% of the CO2 in the atmosphere comes from land-use.
问题描述：
Their research shows that 80% of the CO2 in the atmosphere comes from land-use.
（l开头的单词）
答
industrial research工业研究
他们的工业研究显示80%的大气层中的二氧化碳来自于土地使用.