Based on this foundation, basic models of plow-bottom surface are ruled surface and negative constant curvature surface.

据此得出直纹和负常曲率两类曲面可作为犁体曲面的基本模型。

youdao

The hyperbolic surface, which has so-called negative curvature because its surface curves up and down at the same time, like a saddle.

双曲曲面，即通常所称的负曲率，因为它的表面同时向上和向下弯曲，就像一个马鞍。

youdao

Curvature of the surface prevents slump block from becoming completely detached.

表面的曲率防止滑塌块完全脱离。

youdao

These actuators maintain the curvature of the surface as the mirror moves.

ECONOMIST: Beneath the Southern Cross I stand | The

"With more than five years research behind developing the optimum curvature, the entire screen surface is equidistant from the viewer's eyes, eliminating the problem of screen-edge visual distortion and loss of detail, " the company said in a press release.

BBC: LG to start selling curved OLED TVs in South Korea