n.化石；石化作用；吓呆
The petrified wood fossils have been preserved for millions of years by the process of petrification, a process which turns the wood into quartz crystal, harder than steel. 石化木材的化石自石化过程起，已经历了数百万年，石化过程会将木材转变成为比钢铁还要坚硬的石英晶体。
