If the cargo on offer of any particular class of goods is large enough and regular enough, it is increasingly common to build and use special ships.
Ukuba umthwalo obekiweyo wohlobo oluthile lomgangatho weempahla inkulu ngokwaneleyo kwaye iqhelekile ngokwaneleyo, inyuka ngokuqhelekileyo ukwakha nokusebenzisa inqanawa ezingaqhelekanga.