The indelible scars of this megaflood 大洪水造成的无法磨灭的痕迹

166. But these spectacles are short-lived.
     但这些壮丽景观很短命
167. Just a few days later,
     仅仅几天之后
168. all that remains is an eerie silence.
     只剩下一片诡异的寂静
169. The indelible scars of this megaflood
     大洪水造成的无法磨灭的痕迹
170. still mark the American landscape today...
     如今仍在美国的地貌上显现
171. yet since the dawn of the Ice Age,
     然而自从冰河时期起始之时
172. there have been more than 50 cycles of ice buildup and melt...
     已经发生50多次结冰融化的循环

来自《我们星球上的生命 第一季 第八集 Life on Our Planet S01E08 冰与火的世纪》第 169 行