Cov lag luam tsuas siv nyob rau hauv ntau hom kev siv tsuas thiab npaj siab rau kev ua haujlwm ntev nyob hauv qhov chaw txom nyem tshaj plaws, thaum muab cov theem ntawm kev nyab xeeb thiab tsim tau zoo tshaj plaws. Cov kab txuas hluav taws xob no muaj qhov hloov tau yooj yim, torsion thiab cab kuj, ntxiv rau qhov tshwj xeeb ntawm qhov hluav taws xob, ntsuas kub tsis txaus, puas thiab nplaim hluav taws tsis kam.
