名词
中文翻译：点火器旋钮
同义词：
['ignition knob', 'spark plug knob']
例句：
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1.The car's engine was running smoothly when I turned the primer knob.
当我转动点火器旋钮时，汽车的引擎运行得非常顺畅。
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2. The mechanic checked the spark plug knob before starting the car.
在启动汽车之前，机械师检查了火花塞旋钮。
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3. He adjusted the spark plug knob to ensure the engine would start properly.
他调整了火花塞旋钮以确保发动机能够正常启动。