The children in class two grade three are very happy, because they're going to be in grade four!
三年二班的学生非常高兴，因为他们要上四年级了。
Here in Franklin Lakes, students in a second-grade class at High Mountain Road School rolled dice last week to build two - and three-digit Numbers.
在富兰克林湖，高山路小学2年级班的学生们上周通过掷骰子来建立对2位数和3位数的认识。
We selected two three-grade natural classes from Dongjing Junior Middle School in changsha, divided into the experimental class and the control class.
在长沙市洞井中学选取初三年级两个自然班，分别为实验班与对照班。
We selected two three-grade natural classes from Dongjing Junior Middle School in changsha, divided into the experimental class and the control class.
在长沙市洞井中学选取初三年级两个自然班，分别为实验班与对照班。
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