... phantom echo 幻象回波 ghost echo 反常回波 grass 草状回波 林状回波 ...
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... 缺陷回波 flaw echo 幻影回波 ghost echo 草状回波 grass ...
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... geyserite硅华 ghost echo回波 giant''s kettle瓯穴 ...
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ghost echo phantom echo wrap-around 幻影回波
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back wave
There was an echo, and no man ever saw a ghost with a shadow, so why should a ghost's voice have an echo?
刚才的声音有回音，而且也没人看见过鬼魂还有影子。为什么鬼魂的声音还有回音？
youdao
Dr. SCHAWINSKI: The reason we call it a ghost is because we believe it is something called a light echo.
NPR: What Makes Our Solar System Special?
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