【正文】
部分長城高 ( )寬 5米( )。在清朝統(tǒng)治下,中國的邊界一直延伸到長城之外和蒙古,所以建造和維修長城的工事被停止。明朝末年,長城抵御了滿清帝國入侵。后來的長城由漢,隋和晉朝以極大的代價來修理,改建或是擴(kuò)建長城以捍衛(wèi)自己免于北方的侵略。為了避免匈奴人的入侵,他下沿著整個國家的北部邊界建立新的城墻,以連接殘留的防御工事。在從公元前 5世紀(jì)至公元前 221年的戰(zhàn)國時期,秦、魏、趙、齊和燕各國建立廣泛的防御工事來保衛(wèi)自己的邊界。s new northern frontier. Most of the ancient walls have eroded away over the centuries, and very few sections remain today. Later, the Han, Sui and Jin dynasties all repaired, rebuilt, or expanded sections of the Great Wall at great cost to defend themselves against northern invaders. Towards the end of the Ming Dynasty, the Great Wall helped defend the empire against the Manchu invasions. However, when the gates at Shanhaiguan were opened by Wu Sangui, the Manchus quickly seized Beijing and established the Qing Dynasty. Under Qing rule, China39。 The Great Wall of China is a series of stone and earthen fortifications in northern China, built originally to protect the northern borde