So some scholars have suggested that maybe the letter to the Ephesians was originally intended as a circular letter.

所以有些学者认为,也许以弗所书原本是一份通函。

耶鲁公开课 - 新约课程节选

It looks like it was a circular letter meant to be circulated to different churches.

它看起来像是一份通函,由各教会传阅。

耶鲁公开课 - 新约课程节选

And the functionality goes as the square of the difference in electronegativity.

这个公式的泛函性与电负性之差,的平方成比例。

麻省理工公开课 - 固态化学导论课程节选