This is the 871st most frequent Korean word.
대만을
"대만을" means "Taiwan" as the object of a sentence in Korean.
In this case, '대만을' denotes 'Taiwan' as the object of the verb '국가로 인정하는 것에 대해 논쟁을 벌이다' (to debate about recognizing as a nation).
그는 대만을 국가로 인정하는 것에 대해 논쟁을 벌였다.
He engaged in a debate about recognizing Taiwan as a nation.
In this sentence, '대만을' represents 'Taiwan' as the direct object of the verb '여행하다' (to travel).
나는 대만을 여행하면서 좋은 추억들을 만들었다.
I made great memories while traveling in Taiwan.
Here, '대만을' signifies 'Taiwan' as the object of discussion for the verb '주제로 발표를 준비하다' (prepare a presentation on a topic).