单词：contrast medium
contrast medium的用法和样例：
例句
- Hypercalcaemia and hyperphosphataemia were absent, and there was no history of barium study or oral contrast ingestion.患者无高钙血症和高磷血症，也无钡剂检查或口服造影剂的历史。
- After injection of contrast, small tumors are actually drowned by contrast material, so in this case CEUS is not helpful.在注入造影剂后，小的肿瘤竟然被造影剂所掩盖，因此对比增强超声在这个病例中就显得不是那么有用了。
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