我姐姐是一位儿童心理学家，帮助孩子们处理情感问题。

My sister is a child ___psychologist who helps kids with emotional issues.

学校聘请了一位教育心理学家来评估学习障碍。

The school hired an educational ___psychologist to assess learning disabilities.

根据一位心理学家的说法，强迫学生学习他们不喜欢的科目可能会降低他们的积极性。

According to a ___psychologist, forcing students to study subjects they dislike may reduce their motivation.