maceral
A component of coal or oil shale.
A univalent radical derived from solanesol
plural of scheik
(intransitive) To sleep for longer than intended. / (reflexive, now rare) To sleep for longer than one intended. / (transitive) To sleep beyond (a given time), to sleep through (an event etc.).
地質学者は、その鉱床の生成起源を調べるために、顕微鏡で石炭や油頁岩の有機成分を観察した。
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