NOTE [1]
To: All staff
From: Spencer , HR Management
Dear Staff,
I'm glad [2] to inform you that I feel honored to have invited Ming Yang [3], a famous [4] doctor who has worked as a specialist for more than ten years, to give a lecture on healthcare. It is a good opportuntiy for us to learn gain [5] some knowledge about daily healthcare.
Please join the lecture at 4 p.m. this Friday in the conference room.
Thanks for your attention.
Kind Regards,
Spencer
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[1] A better word here would be 'Notice'. (I know the task describing writing a 'note'.) A note is something you write for yourself or for one other person. A notice is a document which is sent to many people.
[2] A better word would be 'pleased'. 'Glad' is an uncommon word. In fact, I cannot think of any occasion when we would say 'glad' rather than 'happy' or 'pleased'.
[3] A doctor would usually have the title 'Dr.': "I have invited Dr. Ming Yang to visit us."
[4 Someone can be famous for dubious reasons. It would be more polite to say that he or she is a well-regarded doctor, or a highly-respected doctor, or a renowned doctor.
[5] 'Knowledge' is something a person has. You can gain or increase knowledge by studying and learning, but you cannot study or learn knowledge itself.
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Great job! There was only one real correction. The remaining comments were merely suggestions.