这是学习英语大难题之一.有时候"a"是强调用的,连native speakers都不是很清楚是为什么,就是这么说的.也许就是因为 "a" + "part" sound like a third word,"apart" 分开的意思.
part 一般不加"a" when we're talking about：
1.indefinite (unquantifiable) portion/amount
2.quality/attribute
给你下文：
Local TV broadcast part of the interview.(no adjective)
Local TV broadcast a crucial part of the interview.(+adjective)
Part of the trouble is that I can’t afford it right now.
（如果说 A part of the trouble is .听起来不自然）
We’ve only done part of the work.
(意味着 vague and undefined amount of work)
We’ve only done a part of the work.
(amount of work we can quantify)
We are glad you have chosen to be a part of our community.
(we look to you as a pillar of the community)
We are glad you have chosen to be part of our community.
(we're glad you're one of us)