grade four

• 四级

grade four的用法和样例：

例句

1. Hurricane Felix has been upgraded to a category four storm.
   飓风费利克斯升至四级风暴。
2. I suggest every province should also convene an all-province conference of cadres from three or four levels, with some from the co-operatives, to thrash out problems.
   我建议各省也开一次全省性的三级或者四级干部会议，掺一部分合作社的干部，把问题扯清楚。