Sister, it's raining. Run! What does the expression pack mean?

This kind of expression pack is usually an image with humor or teasing meaning, which is used to indicate the situation of reminding or warning.

In the expression pack "Sister, run when it rains", "Sister" may refer to the other party, while "Run when it rains" is to remind the other party to pay attention to the weather changes and avoid getting wet by the rain.

The expression pack "Sister, it's raining, run" is often used in relaxed and happy social activities to remind friends or family members to pay attention to some details of life and add some humor.