For the word speed, for example, a past-tense change from sped to speeded may have been accelerated by a shift in the word's meaning from "to move rapidly" towards "to exceed the speed limit."

例如speed，它的过去式从sped变为speeded，这可能是因为该单词的意义由“快速移动”到“加速”的转变。

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So light can be slowed down, but not sped up: the vacuum is nature's open road where light travels at the speed limit.

所以说，光速可以减慢却不能加快：真空好比是自然界的康庄大道，光便以其极限速度疾驰在这条大道上。 欧洲粒子物理研究所的实验室里到底发生了什么？

youdao

For example, if we kept the flow rate constant but changed the speed of the robot, we would see the resin thin out as the robot sped up.

举个例子，如果我们保持流速不变，但改变机器人的速度，我们将看到树脂薄膜作为出机器人加快。

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Conversely, Google also sped up the presentation speed of its Maps products in another experiment, sacrificing quality of graphics for speed.

FORBES: The Business Of Search

Then, after a Well corner, Hearts broke at speed, Bruno Aguiar feeding Driver who sped away from visiting skipper Stephen Craigan only to shoot into the side-netting.

BBC: Hearts 2-1 Motherwell

From a standing start, the reconstructed beam sped back up to the normal speed of light.

BBC: NEWS | Science/Nature | Cool clouds turn light to matter