求翻译：中世纪文学 古英语文学 英格兰岛的早期居民凯尔特人和其他部族,没有留下书面文学作品。5世纪时，原住北欧的三个日耳曼部落──盎格鲁、撒克逊和朱特──侵入英国，他们的史诗《贝奥武甫》传了下来。诗中的英雄贝奥武甫杀巨魔、斗毒龙，并在征服这些自然界恶势力的过程中为民捐躯。它的背景和情节是北欧的，但掺有基督教成分，显示出史诗曾几经修改，已非原貌。按照保存在一部10世纪的手抄本里的版本来看，诗的结构完整，写法生动，所用的头韵、重读字和代称体现了古英语诗歌的特色。是什么意思？

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Medieval Literature, English literature of the early English island residents and other Celtic tribes that did not leave written works of literature. When 5 Century, 3 of the Nordic and Germanic tribes - an Anglo, Saxon and Premier Zhu Rongji- the invasion of the British, they bid the epic-fu, Addis

Old English literature of medieval literature in England the early Celts and other tribes of the island, leaving no written literature. 5th century, original of three Germanic tribes in Northern Europe-Anglo, Saxon, and Zhu-invasion United Kingdom, their epic passed down the beiaowu. Hero Beowulf ki