Pali mitundu ingapo yama coupling, yomwe ingagawidwe mu: (1) Kuyika lumikiza: Amagwiritsidwa ntchito m'malo omwe shafts awiri amafunika kuti azikhala okhazikika ndipo palibe kusunthidwa komwe kumagwira ntchito. Kapangidwe kamakhala kosavuta, kosavuta kupanga, komanso nthawi yomweyo ...
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