雾笛阀门由铜硅合金制成。
雾笛效用试验。
空气在向下运动过程中受到浮标向上的推力，使阀球将阀门里的气舱密封住，这样迫使气流进入雾笛。
Air is forced up from the buoy counterweight tube during downward motion causing the balls to seal the air ports in the valve, thus forcing the air to flow into the whistle.
吹vuvuzela时需要嘴唇和肺部运动协调配合，这样才能吹出音量极高、音调单一的那种声音，跟雾笛的声音有些类似。
Playing the vuvuzela requires a practiced combination of lip and lung action to produce an extremely loud, monotonous sound, a bit like a foghorn.
吹vuvuzela时需要嘴唇和肺部运动协调配合，这样才能吹出音量极高、音调单一的那种声音，跟雾笛的声音有些类似。
Playing the vuvuzela requires a practiced combination of lip and lung action to produce an extremely loud, monotonous sound, a bit like a foghorn.
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