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君士坦丁堡是东罗马帝国的首都。到了15世纪,东罗马被信仰伊斯兰教的奥斯曼土耳其帝国包围,君士坦丁堡也成了基督教势力在东方的一座孤岛。
Constantinople is the capital of the Eastern Roman Empire. By the 15th century, East Rome was surrounded by the Turkish Ottoman empire, and Constantinople also became an island of Christian influence in the East.