剛也搜尋了是否該用Dear在英文商業書信:Although dear can come across as stuffy, it's appropriate for formal emails. Use it when you're addressing a person in a position of respect (e.g., Dear Lieutenant Smith) and in formal business missives such as a résumé cover letter. (Edited)
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Should e-mails open with Dear, Hi, or Hey? - BBC News - BBC.com
21 Jan 2011 — "If you're sending a business e-mail you should begin 'Dear...' -
(Edited)