现代的航空引擎的工作温度在2000摄氏度左右，Stipp博士说，悬浮的火山灰中玻璃状颗粒在800摄氏度时就开始软化。
Modern aircraft engines operate at temperatures of around 2, 000C. Dr Stipp says the glassy particles in the ash cloud start to soften at about 800C.
不同的切削刀具材料在不同的温度点开始软化。
Various cutting tool materials begin to lose their hardness at different temperatures.
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