One of... some of

[HashiriKata]

Sorry to be so disappointing to you, skylee!

But I hope you've spotted the difference in the version in my reply (with 都 in it).

[skylee]

I have. They are each one of the best actors in North America. Yeah~~

[owen]

So am i to tell my Chinese friend who holds a bachelor degree from shanghai normal university and is currently in a masters program, and who told me that that sentence is categorically acceptable, that she has yet to master the chinese language?.....

Sounds like a bummer of an education system and/or language.

I have to add to that 2 Taiwanese friends. One a high school student and one a university graduate. I clarified with all three that the sentence with or without 都 would be complete, standard, and acceptable even within a university (or high school) essay.

That leaves the 'error' with one of three groups: those on this thread maintaining the sentence is non-standard and carries no meaning, my three disparate contacts who are native speakers and maintain the opposite view, or the lack of a comparable concept to that of the gramtically self-contained sentence inherent in all languages i know of in mandarin.

[Quest]

I don't think that plural usage of 之一 (w/他们) is correct/standard, but what else is in the Chinese language?

I agree with skylee on the usage of 其中几位 for "some of".

Or, you can say 他们是北美数一数二的演员。