Ever since I was little, I played soccer and basketball. I also took martial arts in first and second grade.

我很小就开始玩足球和篮球。在一、二年级的时候，我还学武术呢！

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METHODS Re-searchers surveyed 724 first and second grade students in medical and technological university by the questionnaire.

方法对两所大学一、二年级724名学生进行了问卷调查。

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The results show that: 1. Under the conditions of different attack types, master, first and second grade volleyball players 'visual search features has significant differences.

研究结果表明：1、在不同的进攻类型条件下，健将、一级和二级排球运动员的视觉搜索特征存在明显差异。

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The first grade corresponds to the row player, me in this case, and the second grade in each box corresponds to the column player, my pair in this case.

单元格内第一个成绩是我的成绩,每个单元格第二个成绩是,我对手的成绩

耶鲁公开课 - 博弈论课程节选

We went to the same school during first and second grade, and became the best of friends.

NPR: From Pho to Fast Food, an Immigrant's Tale

Three weeks ago, Ursetta's dream became a reality, as Mathematics and Science Leadership Academy opened its doors to 142 kindergartners and first- and second-grade students in Denver's mostly low-income, largely Hispanic Athmar Park neighborhood.

CNN: Teacher turns 'crazy idea' into new school

To rectify the problem, he's decreed that English be taught in all schools beginning in first grade and computer education in second.

FORBES: Issues & Ideas