孙琦说这句话时，他们刚完成这项研究，当时他在哈佛大学公共卫生学院。

Sun, who was at the Harvard School of Public Health when the study was done.

youdao

孙琦说这句话时，他们刚完成这项研究，当时他在哈佛大学公共卫生学院。

Sun, who was at the Harvard School of Public Health when the study was done.

youdao