Why should fishing be divided into two lines?

First: the diameter of the secondary line is generally lower than that of the main line. (Under special circumstances, there will also be "pulling cattle backwards", such as competitive competitions, which is not recommended. This is to prevent the main line from breaking, because there is a float on the main line, which is very troublesome to replace.

Secondly, in order to replace the hook quickly, hang the hook tied to the secondary line in the hanging box, which can ensure the straightness of the secondary line and increase the sensitivity.