國軍轉任◆英文題庫下載題庫

缺題組，請阿摩幫忙補上，感謝！In early times fortresses of earth and wood were raised throughout a large part of Europe. No specialized knowledge was needed to erect these structures: the earth excavated from a circular moat was piled up in the center of the circle to form a mound, varying in height and diameter. Then tower of wood was erected on the top. The sloping sides of the mound were protected by thornbushes, the barbed wires of the time. It was not a very effective means of protection, for it could easily be set alight by the use of burning missiles.
The development of residential archi...
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