Provides a closed space consisting of a polygonal movie. The polygonal film includes one or more unipolar ethylene copolymers, in which case the rate of oxygen delivery from a closed space is 8000-16000 cm3 / h. A method for processing bananas is also provided, which includes: (a) picking green bananas; (b) then placing the green bananas in a closed space; (c) then storing the closed space at 20 ° C or lower for a week or longer; and (d) then ripening the bananas. Let the silver mature
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