此波速率传播一定且有特征频率，所以这个研究团队知道他们找什么，在哪找。
Such waves travel at a known speed and have characteristic frequencies, so the team knew what to look for and when.
此波速率传播一定且有特征频率，所以这个研究团队知道他们找什么，在哪找。
Such waves travel at a known speed and have characteristic frequencies, so the team knew what to look for and when.
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