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| 1. | This is called the piston. at the top of each cylinder you see a spark plug. |
| 汽缸象个罐头，其连杆上有一个圆形的厚金属块，叫做活塞。在每个汽缸的顶部都可看到一个火花塞。 |
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| 2. | Close the circuit and you'll see a blue spark. |
| 接通电路你就会看到一个蓝色的电火花。 |
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| 3. | Close the circuit and you will see a blue spark. |
| 接通电路你就会看到一个蓝色的电火花。 |
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| 4. | In case you do this in a dark room, you may not only hear a crackle, but you may sometimes see a spark |
| 另一种产生电的现象是：通过头部穿脱一件尼龙内衣或尼龙衬衫，如果你在黑暗的房间内，你不仅可以听到噼啦的响声，而且有时可以看到由电产生的火花。 |
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