Ua haujlwm siab conveyor. Cov hauv paus ntsiab lus ntawm lub koom haum muaj kuab ntawm kev ua haujlwm
Lub tswvyim ntawm "varietal conveyor" yog paub zoo rau txhua tus agronomists. Cov kev sib tw conveyor yog ib qho tseem ceeb qhia rau kev txhim kho kev siv rational ...