1. Mashiinka dahaarka koolada kulul: Mari koollo dareere ah oo gaar ah, oo lagu dahaadhay substrate-ka, badanaa waxaa ku jira qaybta dahaarka, mashiin lagu dahaadhi karo substrate kale iyo substrate-ka la dhejiyay. (Waa nooc ka mid ah polymer-ka oo aan u baahnayn dareere, samee...
Akhriso wax dheeraad ah 
