At the Yu Ying charter school in Washington, all classes for 200 students in prekindergarten through second grade are taught in Chinese and English on alternate days.
华盛顿育英特许学校，学生从幼儿园二年级开始就接受隔日英汉语教学。
There were 45 students in one second-grade class, and the teacher had them well under control.
在一个二年级班，通常有45名学生，教师对他们进行有效的管理。
The participants were the second grade junior middle school students.
实验以初中二年级学生为被试。
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