问题
A 40ft shipping container lasts about the same as a 20ft — 20 to 30 years at sea, plus 10 to 20 more on land. The longer floor span sees slightly more flex over time, but the corner posts and walls are equally durable. Most 40ft containers retire at 25 years of total service.
你知道吗？
The lifespan of a 40ft container is often determined by economics rather than engineering. Many are retired from shipping because repairs are no longer cost-effective, not because the structure has reached its limit. 
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