Even if the receiver is known to the writer personally, a formal greeting such as “Dear Sir(s)” or “Dear Madam(s)” is used.

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• （）It is too dear to me. 句中dear一词的含义是（）。
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• －－-Dear! I can't find my notebook.－－- Is there（）in it? Let me help you.
• Itistoodeartome.句中dear一词的含义是（）。