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We're probably at an elevation of about 13,000 feet above sea level.

我们很可能在海拔13000英尺的高度。

《柯林斯英汉双解大词典》

During high tide sea level is just under the level of the deck giving the impression of walking on water.

在涨潮时海平面恰巧在平台之下，给人以行走在水面上的印象。

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It ends at the Dead Sea, the lowest point on Earth, four hundred meters below the level of the Mediterranean Sea.

VOA: special.2009.05.18

Far below sea level, they contain some of the harshest environments on Earth, with no oxygen and no light.

VOA: special.2010.11.10

When the city was founded about one thousand six hundred years ago, the level of the Adriatic Sea was almost two meters lower than it is today.

VOA: special.2009.04.22

The south-east corner of Britain is gently subsiding while the sea is rising, as it warms, so the relative level of the sea is increasing.

BBC: Legacy of Britain's great flood

These include the international seismic monitoring network, the international array of sea level measuring stations (the Global Sea Level Observing System, the Global Telecommunication System of the World Meteorological Organization and associated public geostationary satellites) and the internet.

UNESCO: & CTBTO: Working together to issue timely alerts

An approaching hurricane can actually raise the level of the sea and pull it right up and over the coastline.

CNN: Hurricanes -- slow, methodical, deadly