two return-stroke waveforms双回击电场
two-stroke breathing两次划臂呼吸法
two-stroke engines双冲程发动机
two-stroke oils二冲程油
Two-Stroke Dycle二行程循
a two-stroke二冲程
ADJ（形容词） relating to or designating an internal-combustion engine whose piston makes two strokes for every explosion 两冲程的(内燃机) (US and Canadian word two-cycle) → compare four-stroke