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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For instance, clouds rising in the troposphere, the lower level of the atmosphere where air mixes freely, will bump up against the boundary of the much more stable stratosphere, forming ripples in the process.

MSN: Blame gravity waves for turbulence - Technology & science - Science - LiveScience | NBC News

Zynga could make money off this endeavor by licensing TV rights for Draw Something to CBS and also see renewed interest in Draw Something, which could lead to a bump in activity as the show goes on air.

FORBES: Zynga Is Working On Draw Something Game Show With CBS