They chose to dwell in caves in high positions which made it easy for them to detect their enemy very early. Moreover, by living in such dwellings they didn't have to fear disastrous floods. The caves also served the function of shielding them from wind and rain.
他們選擇居高臨下的岩穴居住，容易發現敵蹤以盡早示警，又不懼水患，並考慮到遮風蔽雨的功能。