translation.en: Without the pencil, subjects were excellent judges, but with the pencil in their mouth -- when they could not mimic the smile they saw -- their judgment was impaired.
translation.zh: 在不含铅笔的情况下，研究对象都能够轻松做出判断 担当他们含着铅笔时 他们无法模仿眼前的微笑 也就无法正确判断