求翻译：柏林墙始建于1961年8月13日，全长155公里。最初是以铁丝网和砖石为材料的边防围墙，后期加固为由瞭望塔、混凝土墙、开放地带以及反车辆壕沟组成的边防设施。柏林墙是德国分裂的象征，也是冷战的重要标志性建筑。是什么意思？

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The fall of the Berlin Wall was built in 1961 on 13 August 2002, the total length of 155 kilometers. Originally, barbed wire and brick to the border fence in material late for rugged Tower, concrete walls, open strip as well as the composition of the trenches of anti-vehicle border facilities. The f

柏林墙始建于1961年8月13日，全长155公里。At first is take the wire netting and the bricks and stones as the material border defense fence, later period reinforces for the border defense facility which by the lookout tower, the coagulation dirt wall, the opening region as well as the counter-vehicles trench is compo

The Berlin wall was built on August 13, 1961, 155 km in length. First is the border fence with barbed wire and bricks as material, later reinforced by the Watchtower, concrete walls, open areas and anti-vehicle trenches, composed of border facilities. Berlin wall was Germany divided symbol, is also

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