clearing medium

例句：

1. 1. The engineer used a special chemical to clear the air in the tunnel.
   工程师使用一种特殊的化学物质来清理隧道中的空气质量。
2. 2.During the cleanup operation, it is important to ensure that all clearing mediums are removed safely.
   在清理操作期间，确保所有清除介质都被安全地移除是很重要的。
3. 3. In this process, the clearing medium is used to remove impurities from the sample.
   在这个过程中，清除介质被用来从样本中去除杂质。