At Niagara Falls, more than 500, 000 gallons (1, 892, 705 liters) of water crash down 18 stories into the Niagara River every second-enough to fill nearly 50 Olympic-size swimming pools in a minute!
2
重达将近8000万加仑的水的重量，这么多水将足够填满121个奥林匹克尺寸的游泳池。
It's weighs as much as nearly 80 million gallons of water, which is enough to fill up 121 Olympic-sized swimming pools.
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