grade怎么读,grade是什么意思

英语人教版五年级下册grade 5下册unit 5 read and write
i'm in class three, grade seven.
remember meeting all of you in grade7 section a period (1a —
佳霖资讯丨对抗新型冠状病毒肺炎多位院士聚焦干细胞
{"grade":"there"}]} o["school"][1]["grade"]