plural engines
plural engines
Learner's definition of ENGINE
[count]
1
: a machine that changes energy (such as heat from burning fuel) into mechanical motion发动机;引擎 2
: the vehicle that pulls a train : locomotive机车;火车头 3 formal + literary
a : something that is used for a particular purpose专用装备 b : something that produces a particular and usually desirable result手段;措施