6 subtracted from 9 is 3.9减6等于3。We have subtracted $25 per adult to arrive at a basic room rate.我们已给每位成人房客减去了25美元，这就是基本的房费价格了。Mandy subtracted the date of birth from the date of death.曼迪用去世的日期减去出生的日期。...
Leaching of copper from chalcocite with acidic acetonitrilecopper sulphate system was studied.研究了用酸性乙腈硫酸铜体系从辉铜矿中提取铜.The paper discusses a new method for producing cupric feed copper sulfate by chalcocite and ehalcopyite....