Izikrufu eziqengqelekayo zithathwa njengoyilo oluqhelekileyo lweplanethi, kodwa kukho iinguqulelo ezininzi, kubandakanya umahluko, ukujikeleza, kunye neenguqulelo eziguqulweyo. Uyilo ngalunye lubonelela ngeenzuzo ezizodwa ngokwezakhono zokusebenza (umthamo womthwalo, itorque, kunye nesikhundla...
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