This is the 4145th most frequent Korean word.
정확도를
"Accuracy" or "precision."
Here, '정확도를' (jeonghwakdoreul) is the object of the verb '높였습니다' (improved), indicating what was enhanced — accuracy.
이 기계는 측정 정확도를 높였습니다.
This machine improved the measurement accuracy.
The term '정확도를' is used as the object of the verb '확인합니다' (checks), showing the act related to verifying accuracy.
그는 항상 작업의 정확도를 확인합니다.
He always checks the accuracy of the work.
In this sentence, '정확도를' is utilized as the object of the verb '평가하는' (evaluating), specifying what is being evaluated — accuracy.