poser
(ichthyology) A large bone in fishes, which extends upward from the base of the pectoral fin and anchors to the cranium above the gills, forming the posterior edge of the gill chamber.
plural of retaliation
(Britain) A particularly difficult question or puzzle. / Someone who asks a question or sets a problem.
A type of boot designed to be worn by soldiers during actual combat or combat training
その試験の最後の問題は本当に難問で、多くの学生を困惑させた。
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DiQt
Free
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