There are several " canaries in the coalmine " that are also suffering .
其它一些预警信号也表现糟糕。
This turns twitter intoan early-warning system ( like a canary in a coalmine ) for spotting negativebuzz and heading it off before it doesreal damage toyour bottom line .
The spontaneous combustion of coal seam , environment control and some other problems in luotuoshan coalmine and wuda coalmine of wuhai city arc investigated and analyzed profoundly in this paper , and some opinions and suggestions are put forward as well .