barium sulfate
barium-sulfate的词性：
n.（名词）
1. A fine white powder, BaSO4, used as a pigment, as a filler for textiles, rubbers, and plastics, and as a contrast medium in x-ray photography of the digestive tract.
硫酸钡：一种细白粉末，BaSO4，可用作色素，纺织品、橡胶和塑料的填充物，还可用作消化道的X光透视中的反衬媒介