A slight decrease in temperature is found for the entire troposphere in the period investigated.
整个对流层平均温度呈微弱下降趋势。
The speed of sound increases slightly with a rise in temperature and falls with a decrease in temperature.
升温速率增大，坯片开始收缩的温度及收缩率几乎不变。
The speed of sound increases slightly with a rise in temperature and falls with a decrease in temperature .
温度的升高或降低对声音传播速度的变化并不产生明显的影响。
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