回答

・the junior class
・the middle class
・the senior class

「小班」可以用the junior class 「中班」可以用the middle class 「大班」可以用the senior class 來表達。

「家中長子是大班，長女是中班，小兒子是小班。」可以用Our older [first ] son is in the senior class, our older [ first ] daughter is in the middle class and our younger [ second ] son is in the junior class. 來表達。

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