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1·One day in fourth grade, our teacher gave us a project in class.

四年级的一天，我们的老师在课堂上给我们一个话题。

2·In fourth grade, she and some of her friends started a good project.

在四年级时，她和她的一些朋友开始了一个很好的项目。

3·He was in the third grade last year and now he is in the fourth grade.

他去年读三年级，今年读四年级。

4·He is a fourth grade primary school student in Hangzhou, Zhejiang Province.

他是浙江省杭州市一名小学四年级的学生。

5·My son was in fourth grade and told me, 'I'm not going to amount to anything because I have nothing to put on my resume.' she said.

“我儿子四年级的时候告诉我：‘我注定一事无成，因为我的简历上没有任何东西可以填。’”她说。

6·The TV station reported that by completing the swim, the fourth grade student from Losbanios broke a record previously held by a 10-year-old boy.

该电视台报道称，这名来自洛斯巴尼奥斯的四年级学生游完了全程，打破了此前由一名10岁男孩保持的纪录。

7·They have been huge supporters of the district's advanced mathematics program, which once began in the fourth grade but will now start in the sixth.

他们一直是学区高等数学项目的大力支持者。该项目本来是从四年级开始，但现在将从六年级开始。

8·Both left school in the fourth grade in Mexico and are resident aliens in the United States.

在墨西哥时两个人都是在4年级退的学，现在都是居美外侨。《柯林斯英汉双解大词典》

9·Remember the first day of fourth grade?

还记得你四年级时入学的第一天么？

10·In six years, he'll be in fourth grade.

六年后，他将上四年级。