按要求写一份50个单词左右的备忘录。
You are the assistant manager. You have been informed that next Wednesday your company'scomputer system will be closed down for at least two hours so that improvements can be made.Write a memo to all staff in your company:
· saying from what time on Wednesday the system will be closed down,
· reminding the staff to save the documents they are working on,
· telling them that the system will be much faster and more reliable after the upgrade.