1. The mechanic replaced the old spark plug with a new one in the car. (机械师用新的火花塞替换了汽车上的旧的。)
2. Make sure to check the spark plug regularly to ensure your engine runs smoothly. (定期检查火花塞，确保您的发动机运行顺畅。)
3. The spark plug ignites the fuel-air mixture in the combustion chamber. (火花塞在燃烧室中点燃燃料和空气混合物。)
4. If your engine is misfiring, it could be a sign that the spark plug needs to be replaced. (如果您的发动机出现点火不良的情况，可能是火花塞需要更换的信号。)
5. It's important to use the correct spark plug for your specific make and model of vehicle. (使用适合您的特定车型的正确火花塞非常重要。)
6. Without a functioning spark plug, your engine won't be able to start. (如果没有一个正常工作的火花塞，您的发动机将无法启动。)