问题
A 20ft shipping container is 8ft 6in (2.59 m) tall externally. Internal headroom is 2.39 m. A 20ft High Cube is 9ft 6in (2.89 m) tall externally with 2.69 m internal headroom. The extra foot of height in a High Cube is a popular choice for offices and garden buildings.
你知道吗？
The external height of a standard 20ft container was shaped by transport limits as much as cargo needs. Designers had to create a unit tall enough for freight but still compatible with ships, trucks, cranes and infrastructure around the world. 
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