usually we use" wanshang hao" when we just meet each other at night,such as before dinner or just to the party.
but use"wan an",sometime means"good night" or say "good bye" ,we often use it before sleep
٧ سبتمبر ٢٠١١
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wan an for 'good night' in Enghlish and wanshanghao for 'good evening'