小学初年级（Junior Grades）：4-6年级；
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student in junior grades 低年级学生
同义词： junior-grade inferior lower-ranking lowly petty(a) secondary subaltern subordinate
以上来源于: WordNet
Staff turnover is particularly high among junior grades.
员工流动率在级别低的职员中特别高。
《柯林斯英汉双解大词典》
There are lots of jobs in junior grades.
初级阶段有很多工作要做。
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Adopted from foster care, the siblings struggled with their grades when they entered junior high school.
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