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.
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.