求翻译：六月二号（星期三）下午两点在教学楼一层会议室听美国加州大学约翰、史密斯博士主讲的英文名歌（folk ballad）要求本系学生准时出席，勿迟早退，勿吸烟。发通知日期为6月1日Keys是什么意思？

六月 二号 (Wednesday) afternoon in the classroom building two floor conference room to listen to John the University of California, speaker of the English name Smith songs (folk ballad) require the student to attend on time, do not retreat sooner or later, do not smoke. Issued a notice dated June 1 Keys

No. 2 June (Wednesday) 2:00 pm in Conference Room Floor 1 listening Teaching University of California in the US will be conducted by Dr John Smith , the folk ballad songs (English name) require the student rebate punctuality, sooner or later, don't refrain from smoking. The date of the notice on 1 J

In June two (Wednesday) 2 pm listen to English name song in a classroom building conference room which US UC John, Dr. Smith lecture (folk ballad) requests originally is the student attends punctually, late do not leave early, do not smoke.Sends the notice date for June 1 Keys

June 2 (Wednesday) teaching building first floor conference room at two o'clock in the afternoon in the United States University of California, conducted by Dr John, Smith called song (folk ballad) requires the students attend, not to fall sooner or later, do not smoke. Notice dated June 1 Keys

In June two (Wednesday) 2 pm listen to English name song in a classroom building conference room which US UC John, Dr. Smith lecture (folk ballad) requests originally is the student attends punctually, late do not leave early, do not smoke.Sends the notice date for June 1 Keys