| 单词 | wave-shell | 
| 释义 | > as lemmaswave-shell   wave-shell  n. Physics each of the imaginary concentric spherical layers in any medium traversed by a wave, such that the vibration of the particles of the layer is always in the same phase. ΘΚΠ the world > matter > physics > mechanics > types of motion > 			[noun]		 > wave > shape, speed, period, length, etc. waveform1845 wavelength1850 wave-front1867 wave-shell1877 wave velocity1887 wave period1909 transient1910 phase velocity1927 incoherence1938 waveshape1940 1877    F. W. Rudler Earthquake in  Encycl. Brit. VII. 610/1  				The points at which a wave-shell reaches the surface form a curve which is conveniently called a coseismal line. < as lemmas  | 
	
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