glacier
(astronomy) A nebulosity surrounding a dying red giant, consisting of material expelled by the star.
(military) An advance through and past enemy lines. / Any major progress; such as a great innovation or discovery that overcomes a significant obstacle.
present participle of maletreat
(geology) A large body of ice which flows under its own mass, usually downhill.
探検隊は下降を計画する前に、氷河のクレバスを注意深く観察した。
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