A signal fire might attract rescuers.

信号火光会把救援的人引来。

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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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They will fire off a signal flare.

他们将发射一枚信号弹。

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

VOA: special.2009.08.13

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

Now random phrases and images came at me the sudden quick-fire assaults that signal a new idea and I knew that they would come in sequence soon enough, their predestined rhythms would assert.

NEWYORKER: Fjord of Killary