问题
Standard ISO shipping containers come in 8ft, 10ft, 20ft, 40ft, and 40ft High Cube. All are 8ft wide (2.44 m). Standard height is 8ft 6in (2.59 m); High Cube is 9ft 6in (2.89 m). Specialist sizes like 45ft and 53ft exist for some markets and uses but are less common.
你知道吗？
The dominance of 20ft and 40ft containers is not accidental. Global ports, ships, trucks and rail systems were designed around these standards, which means even small changes in size can create major inefficiencies across supply chains. 
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