她以每小时50英里的稳定速度驾驶。

She drove at a steady 50 mph.

《牛津词典》

他们认为岛上的人口增长迅速，然后保持或多或少的稳定速度来增长，直到欧洲人的到来引进了岛上居民对其没有免疫力的致命疾病。

They think its population grew rapidly and then remained more or less stable until the arrival of the Europeans, who introduced deadly diseases to which islanders had no immunity.

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我们做过演示的，弹簧连接两个振动物体，但是质量重心，却保持稳定速度。

We did a demonstration there with two vibrating objects with a spring, but yet the center of mass was moving with a constant velocity.

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