n. the phenomenon of not permitting the passage of electromagnetic radiation
n. incomprehensibility resulting from obscurity of meaning
n. the quality of being opaque to a degree; the degree to which something reduces the passage of light
n. 不透明, 电波不透过, 不透明体
[医] 浑浊, 不透明, 不透光, 不透明区, 浊斑