Natural ventilation and sun dried food can reach the objective, but constrained by natural conditions, and it is difficult to ensure food hygiene.
自然通风和日晒可以达到食品干燥的目的，但受自然条件约束，且食品卫生难以保证。
Natural ventilation and sun dried food can reach the objective, but constrained by natural conditions, and it is difficult to ensure food hygiene.
自然通风和日晒可以达到食品干燥的目的，但受自然条件约束，且食品卫生难以保证。
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