It looks like a saddle.

它看起来像一个马鞍。

youdao

In three-dimensions, it could even be a saddle point.

在三维空间中，它甚至可以是一个鞍点。

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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

But I knew he would need my aid. I found my weapons, placed a saddle on my horse and started as fast as possible down the trail taken by Powell.

VOA: special.2010.07.10

Well,I got them saddles built, and then somebody would say 'Hey,why don't you build me a saddle?'" That was how Nancy Martiny got into the saddle making business twenty years ago.

VOA: special.2011.01.31

There was a huge battle, but Bill took control of the big cat and put his saddle on it.

VOA: special.2009.11.28

Aloni, also by Deca, sits under a green roof in a saddle between two slopes.

WSJ: Community by Design | Architecture

The race is run without a saddle, and the jockey need not be on the horse for the horse to win.

FORBES: Bet On The Horse Or The Jockey?: Investing Lessons From An Italian Horse Race

Saddlers declared by their peers to be using sheep's leather, deemed to be an inferior way to finish a saddle, were slapped with hefty fines.

BBC: Lessons from history: Can royalty guarantee a free press?