研究人员说，汽车发动机很快将由激光器来引燃，从而取代火花塞。
Car engines could soon be fired by lasers instead of spark plugs, researchers say.
汽车发动机中激光器可取代火花塞。
小六角火花塞是当前发达国家汽车发动机上普遍采用的点火元件，是我国目前普遍采用的火花塞的换代产品。
Small hexagon spark plugs are the prevailing igniting parts for petrol engine in advanced countries, which are the substitutes of the ordinary spark plugs used in our country now.
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