Cov nas ntxiab muaj lub zog thiab cov lus teb snap mechanism, nrog lub pedal rhiab heev thiab tsim tshwj xeeb cov hniav, uas tuaj yeem ntes nas txhua lub sijhawm. Kev tsim kho tib neeg kom ntseeg tau tias cov nas tsuag raug tua sai thiab mob tsawg.

Cov nas ntxiab muaj lub zog thiab cov lus teb snap mechanism, nrog lub pedal rhiab heev thiab tsim tshwj xeeb cov hniav, uas tuaj yeem ntes nas txhua lub sijhawm. Kev tsim kho tib neeg kom ntseeg tau tias cov nas tsuag raug tua sai thiab mob tsawg.
