By glassy, the eruption cloud that coarserock particle forms jams not only engine, still can wear away windshield, attaint plane navigation and communication system.
由玻璃质的、粗糙的岩石微粒构成的火山灰云不仅堵塞发动机，还会磨损挡风玻璃，损坏飞机导航与通讯系统。
2
Stretched taut and covered in coarse fur, his legs are also like rock.
紧绷的身体，粗糙的皮毛，腿也像石头一样。
3
The deformation of olivine and pyroxene in the rock is the recrystallized process from coarse to fine grain, the spinel has obvious dissolution, migration and reprecipitation.