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堑：壕沟。形容长江地势险要，难以逾越。the strategic position afforded by the Yangtze River, The Yangtze River is known as a natural barrier.
英汉词典共收录311570条英汉翻译词条，基本覆盖所有常用英文单词的例句及中文翻译，是不可多得的英语学习材料。