What is the meaning of the phrase "hand spread the net and live in the Shen 40cm, pocket 100cm"?

Hand Spreading Nets Sumishen 40cm,Pocket 100cm means

1, "Hand Spreading Nets Sumishen 40cm": the "Hand Spreading Nets" in this sentence refers to a kind of fishing nets thrown by hand, while "Sumishen 40cm" indicates the size of the net's mesh or the size of the net's holes. The "shin" here is an ancient unit of length equivalent to one inch, which is about 2.54 centimeters. Therefore, "住申 40cm" means that the mesh size of the net is 40 centimeters.

2. "Pocket 100cm": The "pocket" here refers to the depth or vertical extension of the net, which can also be interpreted as the longitudinal size of the net." 100cm" means the depth of the net. 100cm" means the depth of the fishing net is 100cm.