他获得了心理学硕士学位。

He received his ___M.A. in Psychology.

这位医疗助理负责记录病人的病史。

The ___M.A. is responsible for recording patients' medical histories.

这个8岁孩子的心理年龄测试显示为12岁。

The 8-year-old child's test showed an ___M.A. of 12.