The military aid always has to be within a certant disatance of the president in case of emergency.

军事助理经常需要,待在总统的一定范围内,以防出现紧急情况。

普林斯顿公开课 - 国际座谈会课程节选

So it's probably the personal aid the president physically sees the most.

可能私人助理,是总统见得最多的人。

普林斯顿公开课 - 国际座谈会课程节选

The person president probably sees most is his personal aid.

总统见得最多的人,可能是他的私人助理。

普林斯顿公开课 - 国际座谈会课程节选