• 1. 发送信件: send letter
• 2. 你不要向我发送信件: you don't send me letters
• 3. 发送信件是中世纪: sending letters is medieval

更多释义

• 1.发送未加密的消息类似于使用明信片而不是信封给收信人发送信件。
  Sending an unencrypted message is like sending your correspondence in a postcard instead of an envelope.
  dict.yoduao.com
• 2.然后，通过邮局发送信件，此时信是由写有地址的信封和里面的消息组成。
  You then send your letter, which now consists of the addressed envelope and the message inside, to the post office.
  dict.yoduao.com
• 3.发送加密消息类似于使用信封而不是使用明信片给收信人发送信件；这使其他人很难读到您的信息。
  Sending an encrypted message is like sending your correspondence in an envelope rather than a postcard; it makes it difficult for other people to read your message.
  dict.yoduao.com

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