Say: After the cold front crosses the border, does the temperature drop or rise? I think some books say decreasing while others say increasing. Can you explain it to me?

Generally speaking, the temperature rise refers to the comparison of the temperature after the cold front and during the cold front.

When a cold front crosses the border, there is usually strong wind or rain and snow. After crossing the border, the weather will be fine, and the temperature will be higher than when the cold front crosses the border.

In terms of large temperature changes, cold air passing through in autumn and winter will bring about a drop in temperature, while it will heat up in spring. Here is the comparison between the cold front after crossing and before crossing. For example, it is commonly said that "an autumn rain is cold and a spring rain is warm".