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لماذا تتشكّل مادة قطنية في سرة البطن؟

Keep going البطن 16 نوفمبر 2016

تُصنَع ملابسنا من مواد مثل الصوف والقطن، حيث تتكوّن من خيوط رفيعة منسوجة مع بعضها. ومع مرور الوقت، تتقطّع تلك الخيوط وتصبح فضفاضة....

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