Once the turmoil of the last great melt subsided, 上一次大规模融化引起的混乱 平息之后
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
yet since the dawn of the Ice Age, 然而自从冰河时期起始之时
The indelible scars of this megaflood 大洪水造成的无法磨灭的痕迹
it's the vanguard of a giant tsunami. 这是巨型海啸的先锋部队
The first they see is a wall of dust. 它们首先看到一道尘土墙
and the first hint of the coming apocalypse. 大灾变即将到来的迹象初现
a lake the size of the Irish Sea is unleashed. 一个像爱尔兰海那么大的湖泊 倾泻而下