How does carplay replace the weather unit in reading text?

Carplay replaces the weather unit in the reading text as follows:

1, enter carplay.

2, copy this℃, don't use your own input method, it will make mistakes, then go back to add, search for replacement, and click on the replacement text.

3. Paste the copied℃ into the box of the manuscript (that is, replace the text) (omit one step here, and move to the front of reading), then replace it with℃ as shown in the figure, and then click on the read text to change it into the updated text (this step is very important, and many people fail to replace it for this reason).

4. Run it again, it will show that the replacement is successful, and it will become Celsius, thus replacing the weather unit in the text read by carplay.