residual sulfur content

例句：

1. 1. The soil test showed aresidual sulfur content of0.5%.
   土壤测试显示残留硫含量为0.5%。
2. 2. The manufacturerclaims that the product has a residualsulfur content of less than1%.
   制造商声称该产品的残留硫含量低于1%。
3. 3. Due to the high levelsof sulfur in the coal, the residual sulfur contentin the fuel is very low.
   由于煤炭中硫的含量很高，燃料中的残留硫含量非常低。