grade junior的区别

grade junior的区别 Junior和Grade有什么区别吗?我是高二的,用Junior还是Grade "Junior Grade grade grades的区别 grade school 和grade schools 的区别 degree 和 grade 的区别 grade和level的区别 at a junior high school 和 in a junior high school 的区别 junior和senior区别 grade,score,mark,point的区别 middle school和junior /senior school 的区别 junior high school和middle school的区别