This is the 3575th most frequent Korean word.
발사를
"발사를" means "launch" or "firing" in English, depending on context.
In this sentence, '발사를' refers to the act of launching. It is used as a noun connected to the object particle to indicate what was completed.
로켓의 발사를 성공적으로 완료했습니다.
The launch of the rocket was successfully completed.
Here, '발사를' indicates the action of launching being prepared. It signifies the object of the preparation.
발사를 준비하면서 안전 조치를 점검했습니다.
While preparing for the launch, safety measures were inspected.
In this instance, '발사를' represents the particular event of the launch as the focus of the subsequent result.