These four strokes are intake stroke, compression stroke, power stroke and exhaust stroke.

这四招进气行程，紧缩行程，动力冲程和排气冲程。

youdao

When the piston reaches the bottom of the intake stroke, the intake valve closes, trapping the air-fuel mixture in the cylinder.

当活塞到达进气行程的下止点时，随着空气燃油的混合气进入气缸，进气门关闭。

youdao

The piston travels down on the intake stroke, up on the compression stroke, down on the power stroke and up on the exhaust stroke.

进气行程，活塞下行；压缩行程，活塞上行；做功行程，活塞下行；排气行程，活塞上行。

youdao

Doctors recommend stopping smoking, limiting alcohol intake, lowering cholesterol and saturated fat intake and increasing physical activity to reduce the risk of stroke.

CNN: Vitamin E may reduce risk of stroke

This increased level of potassium intake was also linked to a 24% lower risk of stroke in those adults.

BBC: Increase potassium and cut salt to reduce stroke risk