时差N小时 尼亚加拉大瀑布正在消失(下)（在线收听）

The rate of erosion depends on factors like the volume of water going over the edge, the height of the drop, and the type of rocks that make up the base of the waterfall.

侵蚀率取决于许多因素，如经过悬崖面的水流量、瀑布高度及构成瀑布底部的岩石类型。

At Niagara, the volume of water is very high.

尼亚加拉大瀑布水流量非常大。

In fact, one-fifth of the world’s fresh water empties from the Great Lakes Superior, Huron, Michigan, and Erie over the falls into Lake Ontario.

事实上，全球五分之一的淡水源自五大湖苏比利尔湖、休伦湖、密歇根胡和艾尔湖，它们流经大瀑布最终进入安大略湖。

Niagara is the second largest waterfall in the world.

尼亚加拉大瀑布是全球第二大瀑布。

Before you cancel your honeymoon suite with the heart-shaped tub, keep in mind that in the past 12,000 years the falls have moved about seven miles upstream and,

当你取消配备有心形浴缸的蜜月套房前要知道：在过去的12,000年，大瀑布已经上移了七英里，

at this rate, they will disappear into Lake Erie in just under 23,000 years.

照这个速度推算，再过不到23,000年，它就要永远地消失在伊利湖了。

Enough time to visit on a honeymoon–and even a second honeymoon.

不过，这足够进行一次蜜月之旅，即便是第二次蜜月之旅也来得及。