We can only wonder what might have induced the artist to place this young woman against a backdrop of subaquatic menace, of ancient meandering rivers and treacherous precipices. 我们也只能猜想到底是什么促使达芬奇把这个年轻女子置于一片久远的崇山峻岭蜿蜒河水,如同水下般险恶的背景前。
The western margin of the basin was close to the source regions and very steep, so that pebbly subaquatic alluvial fans were formed that were deposited from a gravity flow. 盆地西缘距蚀源区近,坡度陡,形成了重力流成因的砾石质水下冲积扇。