Ama-Chain rollers ngokuvamile enziwe ngensimbi, futhi ukusebenza kweketango kudinga amandla aphezulu okudonsa kanye nokuqina okuthile.Amaketanga ahlanganisa uchungechunge olune, amaketanga okudlulisela, amaketanga okuthutha, amaketanga okuhudula, amaketango akhethekile ochwepheshe, uchungechunge lwezixhumanisi ngokuvamile zensimbi noma izindandatho, amaketango asetshenziselwa ukub...
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