Ob-kab kab noj hniav sib npaug siab brake ncoo pwm, disc nres ncoo pwm

Cov yam ntxwv ntawm cov pwm no yog:

1. Ib kab noj hniav yog nias los ntawm ib lub tog raj kheej

2. Cov pwm muaj plaub kab noj hniav

3. Cov tub ntxhais (punch) yog cua sov

4. Cov qauv no tuaj yeem tsim lwm hom kev nres tsheb