These two chemicals interact with each other at a certain temperature to produce a substance which could cause an explosion.

这两种化学物质在一定的温度下相互作用产生一种引起爆炸的物质。

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Initial tests showed the device contained ammonium nitrate, the same volatile substance that sparked a massive explosion last month at a fertilizer distribution plant 110 miles north in West, Texas, said Austin fire Lt.

CNN: Austin bomb an amateur job or something more insidious?