[mass noun]a solid fuel made by heating coal in the absence of air so that the volatile components are driven off 焦炭 ■carbon residue left after the incomplete combustion of petrol or other fuels (汽油或其他燃料不完全燃烧后所剩的)废气渣
verb
[with obj.][usu. as noun coking]convert (coal) into coke 把(煤)炼成焦炭
语源
late Middle English (in the sense 'charcoal'): of unknown origin. The current sense dates from the mid 17th cent