If fire breaks out, please call 119.
假如发生火灾，请拨打119。
Sound the alarm bell in case a fire breaks out.
万一发生火灾你就按响警铃。
They must be ready for immediate use when fire breaks out.
它们（指灭火器）必须在发生火灾时能立即投入使用。
I think everyone should know _______________ when a fire breaks out.
我认为火灾爆发时，人人都应该知道如何自救。
Once a fire breaks out, it will cause unrecoverable economic and social losses.
一旦发生火灾，将造成不可挽回的经济损失和社会影响。
This breaks the chain reaction and the fire is eventually snuffed out.
链反应被破坏，火终将熄灭。
This breaks the chain reaction and the fire is eventually snuffed out.
链反应被破坏，火终将熄灭。
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