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1·The play is open to all seventh and eighth graders.

所有七、八年级的学生均可观看此剧。《牛津词典》

2·16 percent of eighth-graders were held back for poor performance.

16%的8年级学生因为成绩差而被留级。《柯林斯英汉双解大词典》

3·One in three fourth-graders couldn't find their state on a map of the U.S.

四年级学生中有三分之一在美国地图上找不到自己所在的州。《柯林斯英汉双解大词典》

4·Fifth graders tended to focus on features of individual eagles.

五年级学生倾向于关注老鹰个体的特征。

5·One study showed that friendships among ninth graders were far from stable.

一项研究表明，九年级学生之间的友谊并不稳定。

6·Our class was studying the Gold Rush, something all California fourth graders learned.

我们班正在学习淘金热，加州所有四年级学生都学过这部分内容。

7·Researchers would like to explore further how parents and schools can help ninth graders by changing their mindset.

研究人员希望进一步探索父母和学校是如何通过改变观念模式来帮助九年级的学生的。

8·The researchers asked fifth graders and college students to create a recovery plan to protect bald eagles from extinction.

研究人员要求五年级学生和大学生制定一个保护秃鹰免于灭绝的恢复计划。

9·All these effects held true for measures of happiness, life satisfaction and self-esteem, with the effects stronger in the 8th and 10th-graders.

在八年级和十年级学生中，所有这些对幸福的衡量、生活满意度和自我满意度的影响表现得更为明显。

10·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。

(1)motor grader自动平地机；自行式平地机