opaqueadj.不透明的；难懂的opaque contrast medium阳性造影剂opaque reflecting layer不透明反射层opaque projection reader不透明缩微卡片放映阅读器opaque-glass lampshade乳色灯罩opaque water-based ink不透明水基油墨opaque alcohol based ink不透明乙醇基油墨opaque catheter material不透X线opaque transparent liquid不透明液opaque dark area of fluid液性暗区opaque-dentine porcelain不透明牙本质瓷