Astonishingly, the Mayans had no metal tools and it is possible that they did not even have the wheel.

让人震惊的是，玛雅人没有金属工具而且很有可能连车轮都没有。

youdao

We have two motors, one on each rear wheel, so the control system has to control each motor independently.

我们有两个电机，每个后轮一个，因此控制系统必须独立控制每个电机。

youdao

It doesn't have a gearstick but on the road can be controlled with brake and accelerator pedals and a steering wheel like an ordinary car.

它没有变速杆，但在陆地上可以通过像普通汽车一样的刹车、油门踏板和方向盘进行控制。

youdao

Now you could do a similar sort of thing, but instead of having a candle, you have a paddle wheel, and the paddle wheel is spun by a weight that's dropping from here to here.

那接下来可以做一件类似的事，但不再是蜡烛，我们将它换成一个桨轮，桨轮末端拴一个重物,它可以从这掉落到这。

麻省理工公开课 - 热力学与动力学课程节选

But of course, as we know and thinking about familiar objects, we don't need to have every single piece of an object, of an identity stay the same to have the same feeling.So-- I think previously I talked about the steering wheel on my car.

但很明显的,根据我们的常识，我们不需要要求,所有的物体，都保持不变,从而得到同一个肉体-,我记得我之前讨论过,我的汽车的方向盘。

耶鲁公开课 - 死亡课程节选

You're not going to start for the rest of your life if you ever need to solve a problem with a computer from scratch, odds are you're going to reach for some off the shelf packages or libraries or tools that other people wrote so that people like us don't have to reinvent the wheel again and again.

如果你想用Scratch来解决问题,却使用其他人写的程序,或者利用现成的资料或工具,这样以来,我们的确可以避免做重复性的工作,但却永远学不会编程。

哈佛公开课 - 计算机科学课程节选

But I was more focused on the Unity Store, and the ability to not have to reinvent the wheel.

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Both Nevada and California require the cars to have a human behind the wheel who can take control of the vehicle at any time.

CNN: Self-driving cars now legal in California

"Nobody should have to recreate the wheel, " said Fatima Shama, commissioner of the office.

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