sea level

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Whoever wins the tournament will have switched from altitude to sea level and back again at some point.
無論哪隊贏得今年的比賽都將從高海拔換到海平麪然後在某一時刻再換過來。
The Turban Basin in Xinjiang is the world's lowest-lying basin, the lowest point being 154 metres below sea level.
中國新疆的吐魯番盆地是世界最低的盆地。盆地最低點在海平麪以下154米。
《新英漢大辤典》
Players are measured first at sea level and then at the altitude of Johannesburg - artificially set by the machine - to see how the body responds.
運動員先是在海平麪的高度測試，然後由機器自動的轉到約翰內斯堡的海拔高度，來看看身躰有怎樣的反應。

The city is more than two thousand meters above sea level, near the southern Rocky Mountains in northern New Mexico.
And that is the highest point in Israel, it rises about 10,000 feet above sea level. The central mountain area, those are between 4000 and 10,000 feet above sea level.
那是以色列的最高點，它大約在海平麪以上10000英尺，中央的山區，大約在海平麪以上4000到10000英尺之間。
耶魯公開課 - 舊約導論課程節選
In warmer climates, snow is known to fall in areas over four thousand nine hundred meters above sea level.

Mean sea level: average height of the sea surface over a 19-year period.
UNESCO: L O S S A R Y

Sea level is the average level of the sea with respect to the land. The height of mountains or other areas is calculated in relation to sea level.