Because in the time of Beowulf, you just had a big central fire pit, and people slept in the hall, ate in the hall, peed and defecated in the hall under the straw.

因为在贝奥武夫的时代，只有一个中央大火坑，人们在大厅里睡觉，在大厅里吃饭，在大厅里的稻草下撒尿和排便。