相反，海克曼将注意力指向在过去40年中不断恶化的家庭环境。

Instead, Heckman directs attention at family environments, which have deteriorated over the past 40 years.

youdao

相反，海克曼将注意力指向在过去40年中不断恶化的家庭环境。

Instead, Heckman directs attention at family environments, which have deteriorated over the past 40 years.

youdao