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undersea exploration — Introduction the investigation and description of the ocean waters and the seafloor and of the Earth beneath. Primary objectives and accomplishments Included in the scope of undersea exploration are the physical and chemical… … Universalium
Migraine surgery — is any surgical operation undertaken with the goal of reducing or preventing migraines. Innovative surgical techniques have been developed to help patients with migraine headaches. Migraines affect an estimated 10% of the worldwide population… … Wikipedia
British Columbian trawl — a midwater trawl set from the stern. It has curved doors (q.v.) at the end of wire side pennants (or lines) which allows for a wider opening of the net when fishing. The mouth of the net is square and the net has four equally tapering sides.… … Dictionary of ichthyology

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