Chifukwa cha mawonekedwe ake apadera, magalasi a vacuum adapanga kutchinjiriza kwake kwapamwamba kwambiri, kungokhala chete, kosavuta kutsitsa ndi zinthu zina, komanso kumadziwika ngati choyimira magalasi opulumutsa mphamvu, omwe amagwiritsidwa ntchito kwambiri pantchito yomanga.
Werengani zambiri