| 释义 |
- 1
The brave Santa is just one feature of the Holiday Train, which zips through the city's subway and on top of its elevated tracks, surprising commuters and delighting youngsters. “节日专列”在芝加哥的地下隧道中飞驰，勇敢的圣诞老人仅仅是“节日专列”的一个特色。 - 2
When a charged particle zips through the chamber, the vapour condenses into a trail of droplets showing the particle's path and, if the box is placed in a magnetic field, its electrical charge. 当一个带电粒子快速穿越云室时，水汽会凝结形成一串小液滴，这样便标识出了该粒子的路径；若将容器置于一个磁场中，还能知道粒子所带电荷的性质。 - 3
Light zips along at the actual "speed of light", faster than which nothing can go, only when it is travelling through a vacuum. 只有在真空中，光的速度才能达到真正的“光速”，这是世界上最快的速度。
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