2) 活动期间活动期间，系统每15分钟发布一次系统公告，提示玩家刷喇叭

2) 活动期间
活动期间，系统每15分钟发布一次系统公告，提示玩家刷喇叭活动正在进行中。

ผลลัพธ์ (อังกฤษ) 1:

2) during the eventDuring the event, a system notice published every 15 minutes, prompting players brush speaker activity is in progress.

ผลลัพธ์ (อังกฤษ) 2:

2) During the event
during the event, the system release announcement system every 15 minutes, prompting players to brush speaker activity is present.

ผลลัพธ์ (อังกฤษ) 3:

2) during the activities of the activities during the period, the system is released every 15 minutes, which is in the middle of the time.