four-stroke engine

• 四冲程发动机是一种内燃机，其工作循环由活塞的四个冲程完成：进气、压缩、做功和排气。它是汽车、摩托车及许多其他交通工具中最常见的发动机类型。

An internal combustion engine that completes a power cycle in four distinct strokes of the piston: intake, compression, power, and exhaust. It is the most common type of engine used in cars, motorcycles, and many other vehicles.

1. Internal combustion engine cycleC1formal

   An engine that completes a power cycle in four distinct strokes of the piston: intake, compression, power, and exhaust.

   四冲程发动机

   • Most modern cars use a four-stroke engine for efficiency.
   • The mechanic explained how the four-stroke engine works.
   • Four-stroke engines are more fuel-efficient than two-stroke ones.