1. What made the electric wire spark? 
   是什么使电线打火？
2. The line of design meticulously was wound in understanding other places of difficulty to a small electric spark. 
   一个小小的电火花，困难会意外地绕过了最为精心设计的线路。
3. fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark. 
   插入内燃机气缸盖通过电火花点燃气体。
4. One that distributes, especially a device that applies electric current in proper sequence to the spark plugs of an engine. 
   分发者，分配者分配者，尤指使电流以正确的顺序进入发动机的装备
5. spark testing of steels 
   钢的火花鉴别

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