问题
A 20ft container floor is about 14.4 square metres externally and 13.9 square metres internally. This is the same as a small bedroom or single garage. The container holds 33 cubic metres of usable volume thanks to its 2.39 m internal height. Useable floor area drops slightly if you add shelves or racks.
你知道吗？
People often picture a 20ft container as a long box. In practice, its floor area is close to that of a small one-bedroom studio in many cities. The surprise is not the size itself, but how efficiently a simple rectangular space can be used when there are no internal walls. 
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