junior class;grade three;

The child has skipped to the third grade as he did exceedingly well in his studies.
这孩子因成绩优异而越级升入三年级.
来源:《现代汉英综合大词典》Most of the senior boys are going steady with juniors and sophomores.
四年级的男生大都总是要同三年级和二年级的学生一起去的.
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