One study of ninth-grade students found that 50 percent of friendships among ninth graders changed from one month to the next, signaling striking instability in friendships.

一项对九年级学生的研究发现，在九年级学生中，50%的友谊每个月都会发生变化，这表明友谊极其不稳定。

youdao

Given all that's riding on having a successful ninth-grade experience, it pays to explore what can be done to meet the academic, social and emotional challenges of the transition to high school.

考虑到这一切皆依赖于成功的九年级经历，那么探索如何在高中过渡期应对学业、社会和情感方面的挑战将是很有价值的。

youdao

My ninth-grade art teacher doesn't give any grade above 94% because, she says, "There's always room for improvement."

我九年级的美术老师不会给分高于94分，因为她说：“总有进步的空间。”

youdao

His ninth-grade English class for boys centers on books that he believes boys find interesting.

VOA: special.2010.12.02

This year, 90 students were accepted for admission to Boston Latin's ninth-grade class (14-15-year-olds).

ECONOMIST: Reverse discrimination

Though she was a ninth-grade dropout, in 1961 she enrolled in night classes to become a medical assistant.

CNN: The voting rights martyr who divided America

Those with a ninth-grade literacy level or higher were 4 to 5 times as likely to maintain their mental capacity with age.

CNN: Experts reveal best ways to save an aging brain