although both deal with negotiation, a mediator needs to maintain (a)
and an advocate partiality in order to (b) crossing over into each other’s role.

a: neutrality b: avoid 이구요
an advocate ____________ partiality 이사이에 왜 동사가 빠졌나요?
의미상 needs to maintain가 들어가야하는데 이렇게 같을경우 동사도 생략 가능한가요?