HINTS:

十以上数字、年份、百分率、金额等都用阿拉伯数字表示，数字采用千位逗号隔断



Then, coming down lower, you see the falls themselves, along a front almost a mile wide, plunges over a 182-foot cliff and flows off through a deep, narrow gorge. And right away, with a flash of understanding, you see the main fact about the Niagara Falls. The falls are moving, the seven-mile-long gorge is merely the track the falls have made as they move along. This instantly reverses all your ideas. On the ground it seemed that the water fell because there was this low place for it to fall into the gorge. Now you see it is the other way round. The falls are the cause, and the gorge is the result.
当飞机降低高度时，你会看到瀑布本身，沿着湖滨约有1英里宽的人行道，水从182英尺高的悬崖直冲下来，然后流入既深又窄的峡谷。你会顿悟你已看到了尼亚加拉瀑布的真面目：瀑布在运动着，而7英里长的峡谷只是瀑布在运动时冲出来的轨迹。这一事实马上使你的想法完全改变。从地面上看，水往下冲入峡谷的原因似乎是因为下面有低地。而现在你会明白，事实正好相反：瀑布是起因，而峡谷才是结果。