deep dive
Used other than figuratively or idiomatically: see deep, dive. / (idiomatic, often with into or on) An in-depth examination or analysis of a topic.
(cytology, dated) The substance from which attraction spheres develop in mitotic cell division, and of which they consist.
polar stratospheric cloud
Alternative form of pear tree
海洋生物学者たちは、水深50メートルのサンゴ礁を調査するために深い潜水を行った。
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