A one-way operation can define a request message but no response message.
单向操作可以定义请求消息，但不能定义响应消息。
But he doesn't want to read the message, no.
但他不想阅读这消息，不。
If you got warning but no error message.
如果你有警告，但没有错误信息。
There is no message, but I know that grandma sent.
没有留言，但我知道是姥姥寄来的。
But no phone has SMS message alert (message tone) assigning to the contact.
但是，没有手机短信警报(消息提示音)分配给该联系人。
Your good friend had come to see you yesterday evening, but you had no time, so he left a message.
你的好朋友昨天晚上来找你了，可是你有事，他给你留了封信。
Your good friend had come to see you yesterday evening, but you had no time, so he left a message.
你的好朋友昨天晚上来找你了，可是你有事，他给你留了封信。
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