The study of ultrasonic contrast agents is a pop subject in modern medical science.
研究背景： 新型超声造影剂的制备及应用研究是近年来超声医学研究的热点和前沿。
That study shows there is no difference in kidney injury between those contrast agents.
研究表明，这两种对比剂的肾损害没有差别。
That study shows there is no difference in kidney injury between those contrast agents.
研究表明，这两种对比剂的肾损害没有差别。
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