Cov khoom siv tswj hwm, hluav taws xob thiab pneumatic yam, li qub thiab lwm yam khoom siv hauv tshuab yog cov khoom lag luam uas muaj npe nrov hauv tsev thiab txawv teb chaws. Lub tshuab yog cov duab plaub sib dhos, daim duab tiaj tus thiab ntseeg tau hauv qhov zoo.
Txhua pawg ua npuas ua npuas muaj lub voj voog ntau lawm ntawm 4-8 feeb thiab muaj kev ua haujlwm siab ntau lawm. Tsis siv neeg pneumatic noj, nrawm nrawm.
Lub tshuab yog nruab nrog cov tshuab nqus hluav taws xob kom zoo thiab cov khoom siv kom hws, uas ua rau cov khoom hloov ceev thiab cov ntsiab lus dej tsawg.