The students in Class Nine had a good time in the school excursion.

九班的同学在学校旅行中过得很愉快。他们去了蓝水水族馆玩了一天。

youdao

My brother is in Class Three, Grade Nine.

我哥哥在九年级三班。

youdao

Children should go to bed before nine every night, or they will be sleepy in class.

孩子们应该在每天晚上九点之前上床睡觉，否则他们在课堂上就会犯困。

youdao

He graduated as the best student in his class in nineteen twenty-nine.

VOA: special.2009.03.15

And nine hours a week of outside-the-class work.

每周还有九个小时的课堂外工作。

麻省理工公开课 - 计算机科学及编程导论课程节选

One nice thing, by the way -- this is just chance I think -- the median answer in the class was nine, which is spot on, so the median hit this bang on.

顺便提一下,有趣的是,我就是顺便提一嘴,班级中位数也是9,中位数正好也是游戏的答案

耶鲁公开课 - 博弈论课程节选

Getting through the day, the nine class periods.

NEWYORKER: Teaching

Over the course of a school year, each of Eagle County's 470 teachers is evaluated three times and is observed in class at least nine times by master teachers, their principal and peers called mentor teachers.

WSJ: Bill Gates on the Importance of Measurement

Prior to beginning his coaching career, White played for the county from 1991 to 2002, scoring more than 6, 000 first-class runs, including nine centuries.

BBC: Hants confirm Fletcher approach