I sent a short message to Apple's mobile phone and replied two times. The content is the same as what I sent in the past, but the first message is preceded by the words "very confused"

The other party must use an Apple device with iOS 10 or above. It has a quick reply function, that is, click twice or long press a message, and a row of icons will appear on it:

Select an icon, and the icon will appear in the upper left corner or upper right corner of the message. If the other party is also an Apple device with the same or above system version, the icon will appear in his message at the same time. However, if the other party's version is low or other mobile phones, the system will automatically send a message to the other party in the form of the text represented by the icon+the original message, and this message doesn't seem to appear in its own information stream (I can't find it here anyway, I am iOS 1 1.

The two short messages you said must be that the other party clicked the far right "?" Icon stands for doubt, which means I don't quite understand this information. On the other hand, there is an icon in his place, but you don't support it. The system automatically sends you a text message "I'm confused: Is it very ..." Then he clicks the Cancel icon and his icon disappears. Then the system sends you a short message "I wonder: Is it very ...".

I guess the other person didn't know what this function was for, so he was driven by curiosity to watch it a little, and if you don't ask him, he may not know that he wasted a few cents here for a long time (PS: I also wasted 6 cents+various online searches to figure it out, so stop talking and cry ... π _ π ...)