When sound wave propagates in air whose temperature changes with altitude, refraction of air happens. Sound will move towards areas with lower temperatures.
当声波在温度随高度改变的空气中传播时，便会发生折射现象，声波会向著气温较低的地方走。
When sound wave propagates in air whose temperature changes with altitude, refraction of air happens. Sound will move towards areas with lower temperatures.
当声波在温度随高度改变的空气中传播时，便会发生折射现象，声波会向著气温较低的地方走。
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