This is the 558th most frequent Korean word.
치료를
"치료를" means "treatment" or "therapy" (accusative form).
Here, '치료를' is used as a direct object of the verb '받고 (receiving)', indicating the action of receiving treatment.
그는 병원에서 치료를 받고 있습니다.
He is receiving treatment at the hospital.
In this sentence, '치료를' acts as the direct object of '시작하기 (starting)', referring to the act of starting medical treatment.
치료를 시작하기 전에 진단이 필요합니다.
A diagnosis is needed before starting treatment.
Here, '치료를' is the direct object of '끝내고 (finished)', referring to the completion of the treatment.