Like the single speed bike they are simple and reliable.

和单速自行车一样，三个速度的车子简单可靠。

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Notice that, according to Hubble's law, the universe does not expand at a single speed .

请注意，根据哈伯定律，宇宙并不是以单一的速度膨胀。

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"Urban density and housing cost are both rising rapidly," says Jinhee Park, principal architect at the Single Speed design (SsD) design firm.

“城市密度和房价都在攀升，”单速设计公司首席建筑师朴真熙(音译)说。

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And if you are looking at a keyboard, we can predict in the real time very rapidly that beat your very single finger typing speed, exactly the letters you like to type and hit, therefore provide a communication mechanism that Christopher Reeve and those similar with him can benefit from.

如果你在看电脑键盘，你可以十分快速地,实时预知自己手指敲击键盘的速度，预知你想录入的字母，这样便为克里斯托弗·里夫,和其他你说熟悉的人提供了一种沟通机制，使他们从中受益。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

Most appliance motors today have a single speed, go on and off frequently (think about your air conditioner or fridge) and hog power on startup, enough to dim the lights.

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The battery powers a high-response 80kW AC synchronous motor, rated at 107 horsepower and 187 lb-ft of torque, which drives the front wheels through a single speed reducer.

ENGADGET: Nissan starts US production of 2013 Leaf, vows faster charging and a lower entry price

The vehicle has a single-speed transmission that makes it feel sprightly off the line, producing acceptable acceleration (reported at 9.5 seconds from zero to 60), good for around town, and a top speed limited to 85 miles per hour.

FORBES: 2012 CODA Sedan -- Changing Perceptions Of All-Electric