大概意思.
声音是压力波(我想是纵波的意思),由紧密和稀疏的部分组成(疏部和密部吧).解释一下两条结构干涉的声波的变化.(最后没怎么明白,我想它要解释两条声波的干涉...哦 相长干涉（constructive interference）就是干涉增强振幅什么的.)
一道物理题,求英语能人sound is a pressure wave that consists of compres
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