下列属于行政合理性原则具体内容的是（）。
Paragraph Nine
In a new study, a team of neuroscientists and psychologists from Massachusetts Institute of Technology (MIT) discovered that the harder adults tried to learn an artificial language, the worse they were at deciphering the language's morphology - the structure and deployment of linguistic units such as root words, suffixes, and prefixes.
A scientific discovery on language l_______.