First he carefully unscrewed the steering wheel cover, revealing the guts of the ignition system. He tore away frayed wires, stripped them to expose enough metal to cause a spark.

首先，他仔细地拧下方向盘盖，露出里面的点火系统，借着撕开磨损的电线外皮，露出足以点火的金属线芯。

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However, it requires that lasers of high pulse energies are used; just as with spark plugs, a great deal of energy is needed to cause ignition of the fuel.

然而，这就要求使用高脉冲能量的激光器；与火花塞一样，需要大量的能量来引燃燃料。

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Insufficient ventilation may cause overheating or ignition of wax.

通风不足可能会导致过热或蜡点火。

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Engineers discovered the problem during fueling, and worried that any excess hydrogen on the launch pad could cause an explosion during engine ignition.

VOA: standard.2009.03.15