事先通知

    shìxiāntōngzhī

    1. Verbto announce in advance; preliminary notification

    会议改期了,应该事先通知所有人。Huìyì gǎiqī le, yīnggāi shìxiāntōngzhī suǒyǒurén.The meeting has been rescheduled, and everyone should have been informed in advance.