1. Cov khoom siv thev naus laus zis: Peb yuav xaiv 5-10 cov khoom lag luam uas ua tau raws li peb cov qauv los ntawm 100 cov khoom siv hlau, thiab cov khoom seem yuav raug muab xa mus rau cov chaw tsi
Yim lub ntsiab lus rau kev xaiv lub tsheb kauj vab peb lub log
Classification ntawm tricycles
