Sometimes the flood seems to be the result of very heavy rain, but in other descriptions it seems to be a real cosmic upheaval.

有人说，大洪水是大雨导致的，还有人说，是因为宇宙变动引起的。

耶鲁公开课 - 旧约导论课程节选

There are some passages in which the flood is said to have lasted for 40 days, or be on the earth for 40 days.

有些片段描述，比如说在《创世纪》第7章第17节中,雨要下40天。

耶鲁公开课 - 旧约导论课程节选