sea level

US 
UK 
  • na.海(平)面;标准[平均]海面
  • Web海平面;海平面级别;海平面空气
sea-level
n.
1.
海平面the average height of the sea/ocean, used as the basis for measuring the height of all places on land
50 metres above sea level
海拔 50 米

Sample Sentence

Definition:
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