Their memory improved significantly, so their intelligence level as taking by tests before and after compared to control group improved significantly after a single week.

他们的记忆力有明显改善，他们的智力水平,在实验前后进行测试，再与对照组相比,在仅仅一周后就有明显改进。

哈佛公开课 - 幸福课课程节选

Their memory improved, and they persisted more on difficult tasks.

他们的记忆力得到改进，面对困难任务时更有持久力。

哈佛公开课 - 幸福课课程节选