hopper crystal
(mineralogy) A mineral crystal whose interior space is empty
(law) An error in pleading.
A surname.
A fictional character, a daring and mysterious avenger, created in 1919 by pulp writer Johnston McCulley.
顕微鏡の下で、地質学者は中空の結晶の精巧な段差に感嘆した。
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DiQt
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