随着那些宇宙粒子进入大气层，并且和空气，水，岩石或别的什么阻挡在他们飞行路径上的东西中的原子碰撞，它们就会触发其他粒子的级联反应。
As cosmic particles enter the atmosphere and bump into atoms of air, water, ice, rock or anything else that happens to stand in their way, they trigger telltale cascades of other particles.
在容易发生侧面碰撞的快捷干道上，汽车很容易冲撞到正从岔路口进入的车辆，在这样的路上时速应低于30英里(50千米)。
On distribution roads, where side impacts are likely - when a car might ram into the side of another that is pulling out of a side road, for instance - the limit should be 30mph (50kph).
但这只是让飞机进入了另一条拥挤的航线，他还是和另一架飞机发生了碰撞。
That only takes it into another crowded air lane, however, where it collides with a different plane.
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