求翻译：b. 用作防火分隔的防火卷帘，火灾探测器动作后，卷帘下降到底；疏散通道上的防火卷帘，感烟探测器动作后，卷帘下降至距地面1.80m；感温探测器动作后，卷帘下降到底。是什么意思？

b. used as a fire separation fire shutter the the fire detectors action, the shutter fell in the end; evacuation routes on fire shutter after smoke detectors action, shutter dropped to from the ground 1.80m; thermal detectors action the shutter fell in the end after.

正在翻译，请等待...

b. Serves as the fire protection separation the fire protection volume curtain, after the fire detector movement, curls the curtain to drop; Disperses on the channel the fire protection volume curtain, after feels the smoke detector movement, curls the curtain to drop to is apart from ground 1.80m;

B. fire curtain used as fire-resistant partition, after the action of fire detector, curtain fall; exits on the fire curtain, smoke detector after the action, roller blind dropped ground 1.80m; after thermal detectors, shutter down in the end.