坡度的英文：
ascent
grade
gradient
pitch

参考例句：

The real dividing-line between continents and oceans occurs at the foot of a steeper slope.
大陆和海洋的真正分界线是在大陆架较陡峭坡度的脚下。

inclination of building slip
船台坡度

longitudinal grade
纵坡度

The steepness of the slope forbade ascent.
坡度很陡，没法攀登。

The ground drops sharply near the shore.
近海边的地面坡度很大。

A gradient of 1 in 4 is a rise of fall of one metre for every four metres forward
四分之一的坡度是指每前进四米便升高或下降一米。

The steeper the pitch, the more effective the roof is in quickly disposing of rainwater or snow.
屋面的坡度越陡,则越能有效地排卸雨雪。

Psychologists have long assumed that our misperception of slope was biased by fatigue or even fear of falling.
心理学家很早以前认为我们的坡度错觉是由于疲劳甚至害怕坠崖而带有倾向性。

ascent是什么意思：
n. 上升，攀登；提升；上坡（路）；追溯；升天

His own career continues its inexorable ascent.
他事业的上升势头锐不可当。

But some new evidence has been added to the ascent of man.
但是发现的某些新证据已能够用来追溯人类的进化史。

In so doing, one can contribute greatly to the ascent of one's species.
而这么做，你也可对你种族的提升贡献甚大。

grade是什么意思：
n. 年级；阶段；等级
v. 将…按级别分类；给…批分数，改作业；混合

longitudinal grade
纵坡度

There are lots of jobs in junior grades.
初级阶段有很多工作要做。

Red grades into pink.
红色逐渐变成粉红色。

gradient是什么意思：
n. 坡度，倾斜度；梯度
adj. 倾斜的

graduated base relief gradient
分等级的基准宽减梯度

Now it should be a gradient field.
那么它应该就是一个梯度场。

Instead the researchers observed a gradient.
然而研究人员观察到了梯度的产生。