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油耳朵里的"油"是啥？耳屎到底要不要掏？
source link: https://tech.sina.com.cn/d/v/2020-07-02/doc-iircuyvk1581254.shtml
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来源：科普中国如果要给人类舒适行为排行，掏耳朵必定榜上有名。即使没有掏耳勺、棉签，小手指也能成为天然的掏耳工具。但是有一种耳朵，不光掏出来的耳屎油油的，就连摸一下耳道外侧都是油，有时挺尴尬的……很多人担心这是耳朵发炎了。这种“油耳朵”到底是
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