Saguaro cacti stand in the desert as a thunderstorm rolls overhead. Lightning in dry areas increases the risk of brush fires.
雷暴雨滚滚而来，树形仙人掌依然挺立。干燥地区的闪电增加了灌木丛火灾风险。
2
The fundamental structure and design method of four rolls universal mill stand are put forward.
给出了四辊万能机架的基本构造及设计方法。
3
This paper simply analyses the work of the exisiting backup rolls, and brings forward a project to optimize the backup rolls on 4 stand tandem cold strip mill.