병원을

병원을

"병원을" means "hospital" (object form).

In this sentence, '병원을' acts as the direct object of the verb '방문할', indicating the place that is being visited.

저는 오늘 병원을 방문할 예정이에요.

I plan to visit the hospital today.

Although '병원을' translates to 'the hospital', in this context, it means 'hospitals in general' as the object of the liking verb in the negative form.

아빠가 병원을 좋아하지 않아요.

Dad doesn't like hospitals.

Here, '병원을' designates the place previously visited, used with '다녀온', indicating the action of having visited and returned from the hospital.

병원을 다녀온 후에 약을 먹었어요.

After returning from the hospital, I took medicine.