phosphate rock
phosphate-rock的词性:n.(名词)
1. Any of various rocks composed largely of phosphate minerals, especially apatite, used as fertilizer and as a source of phosphorous compounds.磷盐岩:大部分由磷酸盐矿物(尤指磷灰石)组成的一种岩石,可用作化肥和含磷化合物的来源