最終更新日：2024/07/31

A submarine cave or sinkhole, a roughly circular, steep-walled depression that is typically anoxic below a certain depth.

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blue hole

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blue hole

noun

A submarine cave or sinkhole, a roughly circular, steep-walled depression that is typically anoxic below a certain depth.

The blue hole is a fascinating natural wonder.

意味（1）

A submarine cave or sinkhole, a roughly circular, steep-walled depression that is typically anoxic below a certain depth.