“shadow zone”的概念、定义、翻译、参考文献-科学参考

单词	shadow zone
释义	shadow zone [`shad·ō ´zōn] ^ACOUSTICS A region, usually under water or in the atmosphere, which sound waves will not reach, according to ray acoustics. ^GEOPHYSICS The zone, between 103 and 143° from the epicenter of an earthquake, in which direct seismic waves do not arrive because of refraction and absorption by the earth's core.
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