皮肤的秘密 · highlighted by user-1713768040

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[德]耶尔•阿德勒(YaelAdler) [德]卡提雅•史匹哲(KatjaSpitzer)绘

具有强腐蚀性的硫酸十分危险，其pH值低于1。有趣的是，紧随其后的是我们的胃酸，pH值约为1～1.5，在厚厚的黏液层与弱碱性黏液的保护下，我们的胃幸免于胃酸的腐蚀

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