This is the 2060th most frequent Korean word.
수술을
"수술을" means "surgery" (as a grammatical object).
In this sentence, '수술을' (surgery) is used as the object of the verb '받다' (to receive), describing the action of undergoing a surgical procedure.
수술을 받았습니다.
I underwent surgery.
Here, '수술을' is again the object, but this time of the verb '준비하다' (to prepare), indicating the preparation process for a surgical event.
어머니는 수술을 준비하고 있습니다.
Mother is preparing for surgery.
In this instance, '수술을' serves as the object of the verb '하다' (to do), describing the act of performing a surgical operation.