Lub nrawm nrawm ntawm kev lag luam sprocket tsis txawv txav, yog vim li cas tseem ceeb?

1. Ua yuam kev hauv cov iav tsim qauv

2. Ntau yam ntawm lub tshuab ua yuam kev ntawm cov iav qhov txuas, lub suab yuam kev, kev khiav yuam kev, thiab lwm yam.

3, iav log sib dhos yuam kev

4, lub kaw lus deformation tom qab thau khoom