问题
Yes, when sealed.
Shipping containers are largely rodent-proof when sealed. The steel walls and floor block direct entry. Door seals prevent rats and mice getting in if undamaged. Some specialist versions add rodent-proof vent screens for extra protection. Damaged seals are the main entry point — a regular seal check helps keep rodents out.
你知道吗？
Most rodent problems begin when doors are left open or seals are damaged. A well-maintained container offers very few entry points compared with many traditional storage buildings. 
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