Piv nrog rau cov tsoos dej ib txwm muaj, cov ciav tus duab puab sib xyaw ntau ntawm cov duab puab zoo nkauj hauv nws tus kheej thiab nws ib puag ncig, uas ua rau tag nrho zoo nkauj dua, muaj huab cua thiab tag nrho ntawm cov txuj ci zoo nkauj thiab kev txaus siab. Tam sim no nws yog lub tshuab luam kos duab uas siv dav heev.
Pob zeb ciav tus duab puab muaj ntau yam duab, uas tuaj yeem sib faib ua ob hom: cov pas dej dawb thiab cov pas dej nyob sab Europe: cov ciav dej hauv pas dej yog ib txwm txig rau hauv cov nplaim paj, qhaus nplooj thiab lwm yam duab, yooj yim thiab dav.

Txais tos kom yuav cov khoom lag luam zoo thiab ntshiab lub pob zeb dej los ntawm Realho Pob zeb uas yog paub zoo tias yog ib qho ntawm cov ua lag luam thiab cov muag khoom hauv Suav. Raws li kev tswj hwm nruj thiab kev tswj hwm qhov system, peb tus kheej lub pob zeb kev cog lus yuav muab koj cov khoom zoo pob zeb zoo ntawm tus nqi pheej yig.