This article presents a new active fire control alarm system.

介绍了笔者研制的一种主动型火灾自动报警控制系统。

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I'm not sure if the fire is causing them to be more active or just the time of year going into winter.

NPR: Western Wildfires Reach into Montana

Michael Portillo, though potentially formidable, returned to active politics after losing his seat in 1997 with the fire in his belly evidently extinguished, a fact confirmed by his strangely querulous bid for the leadership.

ECONOMIST: Bagehot

The sun is currently in an active phase of its 11-year solar cycle, and it should continue to fire off big storms for a while yet.

MSN: Amazing video captures magical-looking sun storm