https://jp.indeed.com/career-advice/career-development/greeting-from-email
【ビジネス英語】職場で使える英文メールの挨拶文45パターン
https://jp.indeed.com/career-advice/career-development/greeting-from-email
【ビジネス英語】英文で使われる"e.g."と"i.e."の違いとは?
https://jp.indeed.com/career-advice/career-development/eg-vs-ie