青云翻译

行为科学家曾做过无数次实验证明，任何人，往往重复已立即由一个愉快的结果的行为。

behavioral scientists have done countless experiments to prove that any human being tends to repeat an act which has been immediately followed by a pleasant result.

behavioral scientists have done countless experiments to prove that any human being tends to repeat an act which has been immediately followed by a pleasant result.

behavioral scientists have done countless experiments to prove that any human being tends to repeat an act which has been immediately followed by a pleasant result.

behavioral scientists have done countless experiments to prove that any human being tends to repeat an act which has been immediately followed by a pleasant result.