Tukwanen shayi na yumbu al'adun Sinawa ne na shekaru 5,000 da suka wuce, kuma yumbu shine ma'anar tukwane da faranti. Mutane sun ƙirƙira tukwane tun farkon zamanin Neolithic, kusan 8000 BC. Abubuwan yumbu sun fi yawa oxides, nitrides, borides da carbides. Kayan yumbu na yau da kullun sune yumbu, aluminium ...
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