請(qǐng)將下面這段話翻譯成英文：

　　長(zhǎng)城

　　長(zhǎng)城又稱萬(wàn)里長(zhǎng)城，是古代中國(guó)為抵御不同時(shí)期塞北游牧部落聯(lián)盟的侵襲，修筑規(guī)模浩大的軍事工程的統(tǒng)稱。長(zhǎng)城東西綿延上萬(wàn)華里，因此又稱作萬(wàn)里長(zhǎng)城�，F(xiàn)存的長(zhǎng)城遺跡主要為始建于14世紀(jì)的明長(zhǎng)城，西起嘉峪關(guān)，東至虎山長(zhǎng)城，長(zhǎng)城遺址跨越北京、天津、青海、山西、內(nèi)蒙等15個(gè)省市自治區(qū)，總計(jì)有43721處長(zhǎng)城遺產(chǎn)。

　　參考譯文

　　The Great Wall

　　The Great Wall, also known as the ten thousand-meter wall, was made of sections of earlier fortifications joined together to form a united defense system against invasions from the north. The distance between the west and east amounts to ten thousand meters. Hence it is also known as the ten-thousand-meter wall. The current ruins of the Great Wall were mainly built in the Ming Dynasty in the 14th century, which begins at Tiger Mountain in the east and ends at Jiayuguan in the west, and crosses 15 provinces or cities, such as Beijing, Tianjin, Qinghai, Shanxi Province, Inner Mongolia and others. There is a total of 43,721 heritages of the Great Wall.

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