问题
6.06 metres outside, 5.90 metres inside.
A 20ft shipping container is 6.06 m (19ft 10in) long externally. Internal length is 5.90 m (19ft 4in). The slight difference comes from the wall thickness and end frame. All ISO 20ft containers share this exact length for global handling compatibility.
你知道吗？
The length of a 20ft container became a global standard because it balanced carrying capacity with practical handling. That decision still influences transport networks around the world today. 
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