Paul pushed away from the rock ledge, turned, and climbed over a sloping surface.

保罗推开岩石壁架，转身爬过一个倾斜的表面。

An inclined plane can be pretty much any object — a ramp, a slide, or even just a block of wood — as long as it consists of a sloping surface.

斜面几乎可以是任何物体——斜坡、滑梯，甚至只是一块木头——只要它由一个倾斜的表面组成。