求翻译：到了20 世纪60 年代，中苏关系破裂，中国北部边疆压力再度凸显，受此制约“中美之间的地缘较量线维持在中国近岸一带，沿海安全得不到有效保障，西沙等外岛更无力收复。为避免美蒋的海空袭扰，工业布局被迫向交通运输相对不便的内陆倾斜，原来工业技术基础较好、海运方便的沿海地区却不能放手建设，这些都严重制约了国家发展。”是什么意思？

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In the 1960s, the relations between China and the Soviet Union broke up, pressure on China's northern frontier, again highlighting the constraints of "Sino-US between geopolitical contest in China maintained close to the coast line along coastal security, lack of effective security, Sai Sha xternal

To the 20th century 60's, the Sino-Soviet relations burst, the northern China border area pressure highlights once again, “between China and America's geography contest line is maintained this restriction area the Chinese near bank, the coast cannot obtain the effective safeguard safely, the Xisha s

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