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1. Oxford Dictionary

   sea level

   英式

   • n.
     the level of the sea's surface, used in reckoning the height of geographical features such as hills and as a barometric standard

   • noun: sea level, plural noun: sea levels

2. • 釋義

   n.

   名詞

   • 1. the level of the sea's surface, used in reckoning the height of geographical features such as hills and as a barometric standard it is only 500 feet above sea level