这四招进气行程，紧缩行程，动力冲程和排气冲程。
These four strokes are intake stroke, compression stroke, power stroke and exhaust stroke.
两冲程汽油动力的工具的环境污染和噪音是众所周知的厉害，但电动的替代品又往往持久力不足，难以实际使用。
Two-stroke, gas-powered tools are famously polluting and loud, but electric variants typically lack the power or durability to really be practical.
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