I could ask my watch to show me the last message or email I received through iMessage and it would pop up on the nano screen.
这样以来，我就能直接对着nano手表说话来让它在屏幕上显示刚收到的邮件和短信。
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The sendMessage() function creates an AsyncMessage, which is an implementation of the IMessage interface, and then sends the message using the producer’s send() method.