Constantinople's location also ensured its existence would stand the test of time; for many centuries, its walls and seafront protected Europe against invaders from the east and the advance of Islam.
君士坦丁堡的地理位置亦保证其能够经受历史的考验：在数个世纪内，其城墙和海区保护欧洲免受东面入侵者的侵袭和伊斯兰教的推进。