The reason for this is not known, but there are some suggested explanations such as that it was due to a shortage of time or materials, or that it was to show off the builders' power to other war lords.
これはただ単に石材や、時間が不足していたためだとか、権力の強さをほかの国々に誇示するため、等さまざまな説があり、正しいことはまだはっきりしていない。