1. A gifted American psychologist has said,
    一位天才的美国心理学家曾经说过

2. You should see a psychologist.
    你该去见一位心理学家.

3. Psychologist Arthur F. Kramer tested volunteers working on arithmetic problems.
    心理学家阿瑟·费·克雷默对一些正在解算术题的志愿者作过测试。