Utoto umanena za zinthu zomwe zimatha kudaya mitundu yowala komanso yolimba pansalu za ulusi kapena zinthu zina. Malingana ndi katundu ndi njira zogwiritsira ntchito utoto, amatha kugawidwa m'magulu ang'onoang'ono monga utoto womwazika, utoto wokhazikika, utoto wa sulfure, utoto wa vat, utoto wa asidi, utoto wachindunji, solv ...
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