单词	tephra
释义	tephra /ˈtɛfrə / noun [mass noun] Geology Rock fragments and particles ejected by a volcanic eruption.Any such lateral motions could contribute to the absence or thinness of distal marine tephra layers on submarine high points or steep slopes.... Two types of tephra fallout deposits have been observed. Some reports are stating that that tephra rim could collapse later this year. Origin 1940s: from Greek, literally 'ash, ashes'.
随便看	time delay time deposit time-depth time derivative time detector time difference time differential time dilatation time dilation time disc time disk time displacement time-distance time division time division multiplex time domain time draft time-drop time element Time-ese time-expired time-exposed time exposure time-fellow time-filler

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