In the survival of the apocalypse, ropes are particularly important.
The teacher had collected a lot of ropes and stored them in the building; she was a woman of great foresight and vision. Only when Ban Xia grew up did she realize the teacher's remarkable abilities. She discovered that the teacher had thought through and arranged every little detail. In the most chaotic and difficult days, she dragged young Ban Xia to gather supplies bit by bit and to turn Building 11 of Meihua Villa into a sturdy fortress.
Eventually, she rested forever under the greenery downstairs, and although the girl was alone, she was still well-protected.
Ban Xia put two bundles of green nylon rope over her shoulders, one with a diameter of 8 mm, the other 10 mm, both very sturdy, and then she went downstairs.
Setting traps is also a matter of knowledge, as animals are smarter than humans think. Not underestimating the intelligence of other creatures is one of the survival rules taught by the teacher.