你们在不同的年级吗？
We are in the same class, but in different grades.
我们在同样的班级，但在不同的年级。
They are in the same school, but in different grades.
他们在同一所学校，但在不同的年级。
We are in the same school, but we are in different grades.
我们在同一所的学校，但在不同的年级。
There was significant difference in mood state among students of different grades;
不同年级高中生的情绪状态有显著差异；
There was significant difference in mood state among students of different grades;
不同年级高中生的情绪状态有显著差异；
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