事先通知

preliminary notification / to announce in advance

matter / thing / item / work / affair / CL:件[jian4],樁|桩[zhuang1],回[hui2]

in advance / before the event / beforehand / prior

early / prior / former / in advance / first

to go through / to know well / (suffix) expert / to connect / to communicate / open / to clear / classifier for letters, telegrams, phone calls etc

classifier for an activity, taken in its entirety (tirade of abuse, stint of music playing, bout of drinking etc)

to notify / to inform / notice / notification / CL:個|个[ge4]

to know / to be aware