oil shales
(Scotland) The titlark (Anthus pratensis).
To keep back; to retain. / To keep in store for future or special use. / To book in advance; to make a reservation. / (obsolete) To make an exception of; to except.
(military) resistant to fragments of exploding shells
plural of oil shale
地質学者たちは採掘の可能性を判断するために峡谷沿いの油頁岩を採取した。
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