spark plug

1. The part of some internal combustion engines which forms a high-voltage electric spark which ignites the fuel-air mixture to begin the power stroke. (Petrol engines have spark plugs. Diesel engines do not have them because the heat from their high compression ratios supplies the ignition.)

   In the 21st century, it is not unusual for a set of spark plugs to last a decade or longer; gone are the days when changing the plugs annually was common.

   Zündkerze

   запа́лювальна сві́чкаzapáljuvalʹna svíčka, сві́чка запа́люванняsvíčka zapáljuvannja, сві́чкаsvíčka

2. (переносно)Someone who is a driving force in new endeavours.

   Helen is a real spark plug. We're lucky she's on the team.

3. A rod (for cylindrical secondaries) or sphere (for spherical secondaries) of fissile material at the center of the secondary of a multistage thermonuclear weapon, which undergoes nuclear fission when compressed to supercriticality by the imploding secondary, helping to raise the secondary to the pressures and temperatures necessary to ignite nuclear fusion in the secondary's fusion fuel.

1. The spark plugs aren't the problem.

   Проблема не в свечах зажигания. — odexed

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2. Why didn't you replace the spark plugs?

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3. Your spark plugs need to be changed.

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4. You need to learn how to change spark plugs.

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5. It could just be a problem with the spark plugs.

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