name two materials the sound must travel through to reach her ears.1.___________2.___________

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name two materials the sound must travel through to reach her ears.1.___________2.___________
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name two materials the sound must travel through to reach her ears.1.___________2.___________
name two materials the sound must travel through to reach her ears.1.___________2.___________

name two materials the sound must travel through to reach her ears.1.___________2.___________
说出两种材料的名称,声音必须经过它们,才能到达她的耳朵.
1.__air_________2.___________
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