It was a simple system with only three speed codes-normal, caution and stop.

这是一个简单的系统以只三速度代码正常，小心和中止。

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Lucas was forced into two tactical fouls to stop breaks, and was fortunate to escape without a caution.

卢卡斯在阻挡时不得不两次使用战术犯规，逃过处罚他很幸运。

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What do such stop, caution, and go symbols tell consumers?

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Heidfeld led as the safety car pulled off, ahead of eight other cars which did not stop during the caution period, and Kubica in 10th place.

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In fact, some experts caution patients that, over time, certain medications may stop working effectively and may actually cause rebound -- or overuse -- headaches.

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