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1·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。

2·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。

3·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。

4·The air in a cloud is always moving around. This causes some of the droplets to bump into others. (1) The bumping droplets join together, forming larger droplets.

云中的空气总是在移动着。这便引起一些水滴相互碰撞。相互碰撞的水滴结合在一起，形成更大的水滴。

5·The tiny droplets of water that make up a cloud bump into each other as air currents move through the cloud.

气流穿过云层时，形成云的微小水滴相互碰撞。

6·But the fellow experienced friends definitely will bump into this kind of kind of phenomenon: is the brand-new part obviously, how when testing actually leaks air.

但是各位有经验的朋友肯定会碰到这样一种现象：明明是全新的元件，怎么试机时却老是漏气。