A signal fire might attract rescuers.

信号火光会把救援的人引来。

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The second, research the acting means of presentiment system, this part is consist of spy and patrol signal fire transferring and recovery per se.

第二部对汉代居延地区候望系统的运作方式进行研究，由侦察与巡逻、烽火传递与烽燧自身的防御等几个方面的内容构成。

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So there was no half-starved band of survivors huddled in one sealed room using the computer as shipwrecked sailors would a signal fire. Just a machine that had somehow activated itself.

因此，那里没有饿的半死的生存者，卷缩在一个密封房间里，并象沉船的船员用信号火来求救一样，去使用计算机来求救。也许这只是一台机器因为某种原因，自己激活了自己吧。

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The explosion was a signal for all Confederate guns surrounding the fort to open fire.

VOA: special.2009.08.13

That explosion would signal the other guns surrounding the fort to open fire.

VOA: special.2009.08.06

The blazes could signal a difficult fire season ahead.

NPR: Fire Forces Evacuation Of Campus, Homes In Calif.

Services to Heathrow Airport were suspended and First Great Western trains were cancelled after a fire damaged signal equipment on Thursday.

BBC: Paddington rail service returns to normal

Plano, Texas was able to serve 7.5 square miles per fire station with signal preemption, compared with 5.6 square miles without it.

FORBES: Magazine Article