...stance, and therefore difficult to clean off （指尘土、污迹等）积深而难于清除的 *deeply ingrained dirt 积聚得很深的污垢. ..
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deeply ingrained dirt
根深蒂固的污垢
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Petersen hypothesizes that the Acinetobacter comes from dirt deeply ingrained in wounds.
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