Why is the weather forecast of China Weather Network that the sunrise is around 7 o'clock and the sunset is around 18 o'clock today? It should be around 19, right?

This is considered by many factors. What you said will only appear in the spring and autumn equinox or in the equatorial region. Because the terminator line (that is, the arc drawn by the sunrise and sunset points on the earth) changes with the changing law of the year, only the equator is always equal to day and night, which is the time corresponding to 12 hour. Another factor is the time difference. China adopts Dongba time zone where Beijing is located as the standard time, which is called Beijing time or Central Plains standard time. Beijing time is not Beijing time (1 16.4), but local time 120. Therefore, there is a little time difference between most parts of China (including Beijing) and the real Beijing time, which leads to the inaccuracy of sunrise and sunset time 12 hour in some cases.