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.

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。

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The student will probably notice a "bump" in the sound while changing from the sound produced by the air in the cheeks to the sound produced by the air in the lungs.

练习者可能也会注意到在从使用肺部空气转为使用腮部空气的过程中会发出某种冲撞声音。

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War(warm?)air is frequently lighter as the molecules bump around, excited by the heat.

暖空气经常更轻一些，因为分子受到热量的激励而四处碰撞。

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