Some of these systems use radar to keep a car at a set distance from the one in front.

有些这种系统使用雷达让车子和前面的车子保持一定的车距。

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The content-based cluster P2P search model depending on a set distance is proposed in this paper to reduce the query time and redundant messages.

本文提出利用集合差异度实现基于内容聚类的P2P搜索模型提高查询效率和减少冗余消息。

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Laval and Leclercq suggest the driver behavior problems could be addressed by an increasing use of adaptive cruise control (ACC) that can keep the gap between cars at a set distance.

拉瓦尔和勒克莱尔建议，司机们的行为问题可以通过增加使用自适应巡航控制系统（ACC）的途径来解决。 这种系统可以使两车的车距保持在一个设定好的距离内。

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Most of the new collection has racing-friendly complications: chronographs and tachymeters that measure speed over a set distance.

WSJ: The Face of Watchmaking's Future at SIHH and GTE

Between the blind-spot monitoring system, the active lane-keeping, the adaptive cruise control (maintaining a set distance to the vehicle ahead), and the "precollision" system, which uses internal cameras to monitor drivers' faces for signs of inattention, the GS350 is about as close to an automated auto as you'll find on the market.

WSJ: 2013 Lexus GS350 Review: Loaded With Everything but Thrills | Rumble Seat by Dan Neil

Goal: Set a distance, time or calorie goal and see progress toward that goal with simple, full-screen graphics and alerts.

ENGADGET: TomTom makes own-brand GPS sports watches, no Nike swoosh in sight (updated: details)