M'zaka zachidziwitso, ntchito zomasulira zatsala pang'ono kulekanitsidwa ndi luso lazomasulira, ndipo luso lazomasulira lakhala mpikisano waukulu wa opereka chithandizo cha chinenero.Mu dongosolo la ophatikiza nthawi yomweyo kusintha khalidwe ndi kusunga khalidwe bata.
Magulu Athu Akuluakulu a Zida:
● DTP