M'zaka za m'ma 21, ndi chitukuko cha sayansi ndi luso, zambiri, mphamvu, zipangizo, zamoyo zomangamanga wakhala mizati zinayi za chitukuko cha zokolola masiku ano, pakachitsulo carbide chifukwa khola mankhwala katundu, mkulu matenthedwe madutsidwe, matenthedwe ex. .
Werengani zambiri