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আবহবিকারের ফলে উপপৃষ্ঠীয় অংশে লৌহ অক্সাইড জমাট বেঁধে কঠিন ত্বক বা ডুরিক্রাস্ট গঠন করে।
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আবহবিকারের ফলে উপপৃষ্ঠীয় অংশে লৌহ অক্সাইড জমাট বেঁধে কঠিন ত্বক বা ডুরিক্রাস্ট গঠন করে।