以下为句子列表：
英文: But NASA engineers do not know enough about how the two bits of material on Discovery could affect thermal and aerodynamic forces as the vehicle plunges at 22 times the speed of sound through the atmosphere on re-entry.
中文: 不过，美国宇航局的工程师们还不能确定，当“发现”号航天飞机以22倍于音速的速度再次经过地球大气层时，机身上的这两块材料会在热量和空气动力方面产生怎样的影响。
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英文: Might the properties, even the existence, of Hawking radiation depend on the microscopic properties of spacetime—much as, for example, the heat capacity or speed of sound of a substance depends on its microscopic structure and dynamics?
中文: 就像物质的热容量和声速，会和它的微观结构与动力学有关一样，霍金辐射的性质、甚至是否存在，会不会和时空的微观性质有关？
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英文: When did the first measurement of the speed of sound take?
中文: 第一次测量声速是在什么时候？
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英文: （b）The frequency,wave length,and speed of sound are closely related.
中文: 声音的频率，波长和速度三者是密切相关的。
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