海平面的英文：
mean sea level
sea level
sea-level

参考例句：

eustatic cycle is the interval of time during which a eustatic rise and fall of sea level takes place
全球性海面升降周期是发生一次海平面升和降的时间间隔。

What is the force of gravity at sea level?
海平面的地球引力多大?

Coastal deposits are those sediments deposited at or near sea level.
沿海沉积物是沉积在海平面或接近于海平面处的沉积物。

Equality of elevation above sea level.
等海拔高度海平面以上的高度相等

The actual equipotential surface of the earth that corresponds to sea level is called the geoid
相当海平面的地球实际等位面称为重力平面。

eustatic change is pertaining to worldwide changes of sea level that affect all the oceans
全球性海面升降变化是指一切海洋的世界性海平面的变化。

Radar altimeters are used in aircraft to indicate height above the ground of sea
雷达高度表用以指示飞机相对于地面或海平面的高度。

Lowered sea levels exposed the shallow continental shelf beneath the Bering Sea.
逐渐降低的海平面露出了白令海下的浅层大陆架。

It is also very low-lying, at around 395 metres below sea level.
死海的地势也很低，约在海平面以下395米。

He scanned the horizon for any sign of a ship.
他嘹望海平面，看是否有船只出现。

mean是什么意思：
v. 想要；意欲；意味着；预定
adj. 自私的；卑鄙的；平均的；低劣的；低微的，卑贱的
n. 中间；平均数，平均值

That was a mean trick!
那是卑鄙的诡计！

A modifier that has little meaning except to intensify the meaning it modifies.
修饰语除了加强修饰词的意思之外没有实际意义。

get money by dishonest means
非法赚钱, 得不义之财

sea是什么意思：
n. 海，海洋；大量，茫茫一片

Beyond the seas
在国外,在海外

He adventured on a unknown seas.
他冒险驶入陌生的海域。

White breast of the dim sea.
朦胧的海洋那雪白的胸脯。

level是什么意思：
n. 水平线，水平面；高度；层；水平；级别
adj. 水平的，同高度的；笔直的；平静的
v. 推平；毁坏；使平等；瞄准；变平；坦率诚实地对待

Level off the shelves with a spirit level.
用酒精水平仪把架子弄平。

But there is plenty of scope at that level.
然而在此水平上还是有足够的余地。

The worker levelled their looks at the foreman.
工人们用目光逼视着工头。