deep-sea /ˈdipˈsi/
(a.)深海的,遠洋的
Deep-sea a. Of or pertaining to the deeper parts of the sea; as, a deep-sea line (i. e., a line to take soundings at a great depth); deep-sea lead; deep-sea soundings, explorations, etc.
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deep-sea
adj : of or taking place in the deeper parts of the sea; "deep-sea
fishing"; "deep-sea exploration"