1924年一场大火险些毁掉马萨诸塞堂，为竭力找寻起火源头，大堂墙体的一大部分都不得不被拆除了。

In 1924, the hall was threatened with destruction when a fire broke out on the roof. A good deal of the wall had to be torn down in an endeavor to trace the source of the fire.

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消除所有的点火源。使用防爆设备。粉状材料可引起火灾或爆炸事故。吸取材料并置于处理容器中。

Eliminate all ignition sources. Use explosion-proof equipment. Powdered material may be a fire or explosion hazard. Suck up material and place in a disposal container.

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如果存在火源，这会导致起火。

This can cause a fire if an ignition source is present.

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