intake stroke

基本解释

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。
Let air come in more easily - As a piston moves down in the intake stroke, air resistance can rob power from the engine.
使空气更容易进入——在吸气冲程中，当活塞向下运动时，空气阻力将会剥夺引擎一定的动力。
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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。