新颖性：The method involves arranging hem pipes (11, 12) in an inner portion of a hem frame (10) along height direction. A polyethylene pipe is equipped with one of the hem pipes. Polyether sulfone ropes (R1-R3) are equipped with nylon yarn parts (N1, N2) that are combined with an upper portion of the hem pipes. A hem drag net side wall (20) is combined with a lower part of the other he ........
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